Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Summary Collateral Information
	Description
Group 1
Pool 8063	Option ARM
Pool 8064	Option ARM
Pool 8065	Option ARM

General Information
Description	Total	Pool 8063	Pool 8064	Pool 8065	Group 1
Weighted Average Pass Through Rate	6.43335%	7.38353%	6.45162%	6.12600%	6.43335%
Weighted Average Mortgage Interest Rate	7.70038%	7.75853%	7.75792%	7.34142%	7.70038%
Weighted Average Remaining Term (in Months)	405.42532	402.18249	404.22509	413.12427	405.42532
Weighted Average Loan Age (in Months)	3.53826	5.00000	3.40857	4.06199	3.53826
Average Ending Scheduled Principal Balance	$552,456.59	$909,240.52	$552,799.93	$516,109.07	$552,456.59
Remaining Loan Count	1724	25	1440	259	1724
Ending Scheduled Principal Balance	$952,435,154.84	$22,731,013.01	$796,031,893.17	$133,672,248.66	$952,435,154.84

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Geographic Distribution
Total			Pool 8063			Pool 8064
State	Percent	Ending Scheduled Principal Balance	State	Percent	Ending Scheduled Principal Balance	State	Percent	Ending Scheduled Principal Balance
CA	$637,069,025.61	66.89%	CA	$17,182,109.55	75.59%	CA	$512,816,609.03	64.42%
FL	$77,899,644.09	8.18%	IL	$4,517,148.16	19.87%	FL	$73,786,718.64	9.27%
WA	$25,970,037.21	2.73%	OR	$519,702.88	2.29%	WA	$25,504,445.67	3.20%
NY	$23,903,651.42	2.51%	MA	$512,052.42	2.25%	NY	$23,203,980.50	2.91%
AZ	$20,833,298.45	2.19%	WA	$0.00	0.00%	NJ	$17,067,606.98	2.14%
OTHER	$166,759,498.06	17.51%	OTHER	$0.00	0.00%	OTHER	$143,652,532.35	18.05%

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Geographic Distribution
Pool 8065			Group 1
State	Percent	Ending Scheduled Principal Balance	State	Percent	Ending Scheduled Principal Balance
CA	$107,070,307.03	80.10%	CA	$637,069,025.61	66.89%
AZ	$4,187,914.41	3.13%	FL	$77,899,644.09	8.18%
FL	$4,112,925.45	3.08%	WA	$25,970,037.21	2.73%
NJ	$3,548,245.36	2.65%	NY	$23,903,651.42	2.51%
MA	$1,880,793.05	1.41%	AZ	$20,833,298.45	2.19%
OTHER	$12,872,063.36	9.63%	OTHER	$166,759,498.06	17.51%

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Prepayment Information (all groups)
	1 Month	3 Month	6 Month	12 Month	Cumulative
PSA	2571.72091%	4578.35181%	4578.35181%	4578.35181%	4578.35623%
CPR	18.19883%	23.31779%	23.31779%	23.31779%	23.31781%
SMM	1.66006%	2.18821%	2.18821%	2.18821%	2.18821%

Trigger Events
	Trigger Flag
Optional Termination Date Has Occurred; 1=Yes, 0=No	0
Senior Prepayment Step-Down Has Occurred; 1=Yes, 0=No	0
Senior Credit Support Depletion Date Has Occurred; 1=Yes, 0=No	0

Comments

1. The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, to certain Senior Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 20, 2007 to that certain Prospectus Supplement, dated February 13, 2007, to which certain Senior Certificates were offered.

2. The MBA method of delinquency calculation is used.

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Certificate Payment Summary Report
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
1A	933635AA2	$637,887,000.00	$600,601,354.77	$2,859,943.59	$10,254,890.75	$0.00	$0.00	$13,114,834.34	$590,346,464.02
2A	933635AB0	$96,379,000.00	$96,570,092.26	$452,752.79	$0.00	$0.00	$0.00	$452,752.79	$96,570,092.26
CA1B	933635AC8	$91,785,000.00	$87,148,413.27	$399,430.24	$1,281,879.43	$0.00	$0.00	$1,681,309.67	$85,866,533.84
CA1B_GRP1	XXXXXXXXX	$79,737,000.00	$75,076,228.59	$344,099.38	$1,281,879.43	$0.00	$0.00	$1,625,978.81	$73,794,349.16
CA1B_GRP2	XXXXXXXXX	$12,048,000.00	$12,072,184.68	$55,330.85	$0.00	$0.00	$0.00	$55,330.85	$12,072,184.68
CA1C	933635AD6	$91,785,000.00	$87,148,741.99	$402,336.70	$1,281,879.43	$0.00	$0.00	$1,684,216.13	$85,866,862.56
CA1C_GRP1	XXXXXXXXX	$79,737,000.00	$75,076,228.59	$346,601.92	$1,281,879.43	$0.00	$0.00	$1,628,481.35	$73,794,349.16
CA1C_GRP2	XXXXXXXXX	$12,048,000.00	$12,072,513.40	$55,734.77	$0.00	$0.00	$0.00	$55,734.77	$12,072,513.40
1XPPP	933635AE4	$0.00	$326,328.68	$295,315.31	$326,328.68	$0.00	$0.00	$621,643.99	$216,625.70
1XPPP_NOTIONAL	XXXXXXXXX	$878,635,811.00	$831,907,933.01	$295,315.30	$0.00	$0.00	$0.00	$295,315.30	$818,762,906.18
1XPPP_PRINCIPAL	XXXXXXXXX	$0.00	$326,328.68	$0.00	$326,328.68	$0.00	$216,625.70	$326,328.68	$216,625.70
1X2	933635AF1	$65,082,546.00	$27,690,001.05	$29,294.51	$0.00	$0.00	$0.00	$29,294.51	$22,731,013.01

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Certificate Payment Summary Report (Continued)
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
2XPPP	933635AG9	$0.00	$49,872.47	$2,100.00	$0.00	$0.00	$0.00	$2,100.00	$104,497.88
2XPPP_NOTIONAL	XXXXXXXXX	$132,754,877.00	$133,400,997.55	$2,100.00	$0.00	$0.00	$0.00	$2,100.00	$133,672,248.66
2XPPP_PRINCIPAL	XXXXXXXXX	$0.00	$49,872.47	$0.00	$0.00	$0.00	$54,625.41	$0.00	$104,497.88
B1	933635AH7	$16,688,000.00	$16,671,385.38	$78,633.37	$8.66	$0.00	$0.00	$78,642.03	$16,671,376.72
B2	933635AJ3	$17,193,000.00	$17,175,897.99	$81,156.12	$8.92	$0.00	$0.00	$81,165.04	$17,175,889.07
B3	933635AK0	$6,068,000.00	$6,061,969.55	$28,693.32	$3.15	$0.00	$0.00	$28,696.47	$6,061,966.40
B4	933635AL8	$7,079,000.00	$7,071,983.82	$33,650.86	$3.67	$0.00	$0.00	$33,654.53	$7,071,980.15
B5	933635AM6	$6,068,000.00	$6,061,996.72	$28,946.03	$3.15	$0.00	$0.00	$28,949.18	$6,061,993.57
B6	933635AN4	$4,045,000.00	$4,041,016.24	$19,464.23	$2.10	$0.00	$0.00	$19,466.33	$4,041,014.14
B7	933635AP9	$4,045,000.00	$4,041,103.16	$20,272.87	$2.10	$0.00	$0.00	$20,274.97	$4,041,101.06
B8	933635AQ7	$3,034,000.00	$3,031,131.46	$15,711.36	$1.57	$0.00	$0.00	$15,712.93	$3,031,129.89
B9	933635AR5	$4,045,000.00	$4,041,284.24	$21,957.64	$2.10	$0.00	$0.00	$21,959.74	$4,041,282.14
B10	933635AS3	$7,585,000.00	$7,578,032.38	$41,173.98	$3.94	$0.00	$0.00	$41,177.92	$7,578,028.44

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Certificate Payment Summary Report (Continued)
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
B11	933635AT1	$4,045,000.00	$4,041,284.24	$21,957.64	$2.10	$0.00	$0.00	$21,959.74	$4,041,282.14
B12	933635AV6	$3,034,000.00	$3,031,212.96	$16,469.59	$1.57	$0.00	$0.00	$16,471.16	$3,031,211.39
B13	933635AW4	$3,034,000.00	$3,031,212.96	$16,469.59	$1.57	$0.00	$0.00	$16,471.16	$3,031,211.39
B14	933635AX2	$7,591,589.71	$7,584,616.02	$41,209.86	$3.94	$0.00	$0.00	$41,213.80	$7,584,612.08
R	933635AU8	$100.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
TFEE	XXXXXXXXX	$0.00	$0.00	$643.54	$0.00	$0.00	$0.00	$643.54	$0.00
Total*		$1,011,390,689.71	$965,308,930.56	$4,906,939.60	$13,145,026.83	$0.00	$0.00	$18,051,966.43	$952,435,154.84

*Total balances exclude notional balances.

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Total Funds Available for Distribution
PRINCIPAL BALANCE
Scheduled Principal Received or Advanced	($3,204,080.44)
Unscheduled Principal	$1,152,716.59
Prepayments in Full	$14,925,139.57
Repurchases	$0.00
Liquidations	$0.00
Total Principal	$12,873,775.72
INTEREST
Accrued Interest at Gross Rate	$6,193,855.37
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Servicing Fees	$1,018,711.55
Other	$0.00
Total Interest	$5,175,143.92
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$3,046.80

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Total Funds Available for Distribution
ADDITIONAL FUNDS
Other	$0.00
Total Additional Funds	$3,046.80
Total Funds Available for Distribution	$18,048,919.64

Certificate Payment Report - Principal
Class	CUSIP	Beginning Principal/Notional Balance	Principal Distribution	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal Distribution	Ending Principal/Notional Balance
1A	933635AA2	$600,601,354.77	$10,254,890.75	$0.00	$0.00	$0.00	$0.00	$10,254,890.75	$590,346,464.02
2A	933635AB0	$96,570,092.26	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$96,570,092.26
CA1B	933635AC8	$87,148,413.27	$1,281,879.43	$0.00	$0.00	$0.00	$0.00	$1,281,879.43	$85,866,533.84
CA1B_GRP1	XXXXXXXXX	$75,076,228.59	$1,281,879.43	$0.00	$0.00	$0.00	$0.00	$1,281,879.43	$73,794,349.16
CA1B_GRP2	XXXXXXXXX	$12,072,184.68	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$12,072,184.68
CA1C	933635AD6	$87,148,741.99	$1,281,879.43	$0.00	$0.00	$0.00	$0.00	$1,281,879.43	$85,866,862.56
CA1C_GRP1	XXXXXXXXX	$75,076,228.59	$1,281,879.43	$0.00	$0.00	$0.00	$0.00	$1,281,879.43	$73,794,349.16
CA1C_GRP2	XXXXXXXXX	$12,072,513.40	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$12,072,513.40
1XPPP	933635AE4	$326,328.68	$326,328.68	$0.00	$0.00	$0.00	$0.00	$326,328.68	$216,625.70

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Certificate Payment Report - Principal (Continued)
Class	CUSIP	Beginning Principal/Notional Balance	Principal Distribution	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal Distribution	Ending Principal/Notional Balance
1XPPP_NOTIONAL	XXXXXXXXX	$831,907,933.01	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$818,762,906.18
1XPPP_PRINCIPAL	XXXXXXXXX	$326,328.68	$326,328.68	$0.00	$0.00	$0.00	$216,625.70	$326,328.68	$216,625.70
1X2	933635AF1	$27,690,001.05	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$22,731,013.01
2XPPP	933635AG9	$49,872.47	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$104,497.88
2XPPP_NOTIONAL	XXXXXXXXX	$133,400,997.55	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$133,672,248.66
2XPPP_PRINCIPAL	XXXXXXXXX	$49,872.47	$0.00	$0.00	$0.00	$0.00	$54,625.41	$0.00	$104,497.88
B1	933635AH7	$16,671,385.38	$8.66	$0.00	$0.00	$0.00	$0.00	$8.66	$16,671,376.72
B2	933635AJ3	$17,175,897.99	$8.92	$0.00	$0.00	$0.00	$0.00	$8.92	$17,175,889.07
B3	933635AK0	$6,061,969.55	$3.15	$0.00	$0.00	$0.00	$0.00	$3.15	$6,061,966.40
B4	933635AL8	$7,071,983.82	$3.67	$0.00	$0.00	$0.00	$0.00	$3.67	$7,071,980.15
B5	933635AM6	$6,061,996.72	$3.15	$0.00	$0.00	$0.00	$0.00	$3.15	$6,061,993.57
B6	933635AN4	$4,041,016.24	$2.10	$0.00	$0.00	$0.00	$0.00	$2.10	$4,041,014.14
B7	933635AP9	$4,041,103.16	$2.10	$0.00	$0.00	$0.00	$0.00	$2.10	$4,041,101.06

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Certificate Payment Report - Principal (Continued)
Class	CUSIP	Beginning Principal/Notional Balance	Principal Distribution	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal Distribution	Ending Principal/Notional Balance
B8	933635AQ7	$3,031,131.46	$1.57	$0.00	$0.00	$0.00	$0.00	$1.57	$3,031,129.89
B9	933635AR5	$4,041,284.24	$2.10	$0.00	$0.00	$0.00	$0.00	$2.10	$4,041,282.14
B10	933635AS3	$7,578,032.38	$3.94	$0.00	$0.00	$0.00	$0.00	$3.94	$7,578,028.44
B11	933635AT1	$4,041,284.24	$2.10	$0.00	$0.00	$0.00	$0.00	$2.10	$4,041,282.14
B12	933635AV6	$3,031,212.96	$1.57	$0.00	$0.00	$0.00	$0.00	$1.57	$3,031,211.39
B13	933635AW4	$3,031,212.96	$1.57	$0.00	$0.00	$0.00	$0.00	$1.57	$3,031,211.39
B14	933635AX2	$7,584,616.02	$3.94	$0.00	$0.00	$0.00	$0.00	$3.94	$7,584,612.08
R	933635AU8	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
TFEE	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total *		$965,308,930.56	$13,145,026.83	$0.00	$0.00	$0.00	$0.00	$13,145,026.83	$952,435,154.84

*Total balances exclude notional balances.

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Certificate Payment Report - Interest
Class	Beginning Principal/Notional Balance	Interest Rate Accrued	Interest Rate Paid	Interest Accrued	Prepayment Interest Shortfall	Relief Act Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Total Interest Distributed	Total Carryforward Amount Remaining
1A	$600,601,354.77	5.7141600000%	5.7141600000%	$2,859,943.53	$0.00	$0.00	$0.00	$0.06	$0.00	$0.00	$2,859,943.59	$0.00
2A	$96,570,092.26	5.6260000000%	5.6260000000%	$452,752.78	$0.00	$0.00	$0.00	$0.01	$0.00	$0.00	$452,752.79	$0.00
CA1B	$87,148,413.27	5.5000000000%	5.5000000000%	$399,430.23	$0.00	$0.00	$0.00	$0.01	$0.00	$0.00	$399,430.24	$0.00
CA1B_GRP1	$75,076,228.59	5.5000000000%	5.5000000000%	$344,099.38	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$344,099.38	$0.00
CA1B_GRP2	$12,072,184.68	5.5000000000%	5.5000000000%	$55,330.85	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$55,330.85	$0.00
CA1C	$87,148,741.99	5.5400000000%	5.5400000000%	$402,336.69	$0.00	$0.00	$0.00	$0.01	$0.00	$0.00	$402,336.70	$0.00
CA1C_GRP1	$75,076,228.59	5.5400000000%	5.5400000000%	$346,601.92	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$346,601.92	$0.00
CA1C_GRP2	$12,072,513.40	5.5400000000%	5.5400000000%	$55,734.77	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$55,734.77	$0.00
1XPPP	$326,328.68	1890.0341622810%	1085.9553012625%	$513,976.96	$0.00	$0.00	$0.00	$0.01	$0.00	$0.00	$295,315.31	$0.00
1XPPP_NOTIONAL	$831,907,933.01	0.7413949655%	0.4259826670%	$513,976.96	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$295,315.30	$0.00
1XPPP_PRINCIPAL	$326,328.68	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X2	$27,690,001.05	1.2695345320%	1.2695345320%	$29,294.51	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$29,294.51	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Certificate Payment Report - Interest (Continued)
Class	Beginning Principal/Notional Balance	Interest Rate Accrued	Interest Rate Paid	Interest Accrued	Prepayment Interest Shortfall	Relief Act Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Total Interest Distributed	Total Carryforward Amount Remaining
2XPPP	$49,872.47	1314.3621575816%	50.5288789587%	$54,625.41	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,100.00	$0.00
2XPPP_NOTIONAL	$133,400,997.55	0.4913792886%	0.0188904135%	$54,625.41	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,100.00	$0.00
2XPPP_PRINCIPAL	$49,872.47	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
B1	$16,671,385.38	5.6600000000%	5.6600000000%	$78,633.37	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$78,633.37	$0.00
B2	$17,175,897.99	5.6700000000%	5.6700000000%	$81,156.12	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$81,156.12	$0.00
B3	$6,061,969.55	5.6800000000%	5.6800000000%	$28,693.32	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$28,693.32	$0.00
B4	$7,071,983.82	5.7100000000%	5.7100000000%	$33,650.86	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$33,650.86	$0.00
B5	$6,061,996.72	5.7300000000%	5.7300000000%	$28,946.03	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$28,946.03	$0.00
B6	$4,041,016.24	5.7800000000%	5.7800000000%	$19,464.23	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$19,464.23	$0.00
B7	$4,041,103.16	6.0200000000%	6.0200000000%	$20,272.87	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$20,272.87	$0.00
B8	$3,031,131.46	6.2200000000%	6.2200000000%	$15,711.36	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$15,711.36	$0.00
B9	$4,041,284.24	6.3978774280%	6.5199987022%	$21,546.37	$0.00	$0.00	$0.00	$0.00	$0.00	$411.28	$21,957.64	$0.00
B10	$7,578,032.38	6.3978774280%	6.5200006443%	$40,402.77	$0.00	$0.00	$0.00	$0.00	$0.00	$771.21	$41,173.98	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Certificate Payment Report - Interest (Continued)
Class	Beginning Principal/Notional Balance	Interest Rate Accrued	Interest Rate Paid	Interest Accrued	Prepayment Interest Shortfall	Relief Act Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Total Interest Distributed	Total Carryforward Amount Remaining
B11	$4,041,284.24	6.3978774280%	6.5199987022%	$21,546.37	$0.00	$0.00	$0.00	$0.00	$0.00	$411.28	$21,957.64	$0.00
B12	$3,031,212.96	6.3978774280%	6.5199998353%	$16,161.11	$0.00	$0.00	$0.00	$0.00	$0.00	$308.48	$16,469.59	$0.00
B13	$3,031,212.96	6.3978774280%	6.5199998353%	$16,161.11	$0.00	$0.00	$0.00	$0.00	$0.00	$308.48	$16,469.59	$0.00
B14	$7,584,616.02	6.3978774280%	6.5200178716%	$40,437.87	$0.00	$0.00	$0.00	$0.00	$0.00	$771.99	$41,209.86	$0.04
R	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
TFEE	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$643.54	$0.00
Total *	$965,308,930.56			$5,175,143.87	$0.00	$0.00	$0.00	$0.10	$0.00	$2,982.72	$4,906,939.60	$0.04

*Total balances exclude notional balances.

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Principal Factors Report
Class	Original Scheduled Balance	Beginning Principal/Notional Balance	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal	Ending Principal/Notional Balance Percent	Ending Principal/Notional Balance
1A	$637,887,000.00	941.54819705	0.00000000	0.00000000	0.00000000	0.00000000	16.07634385	0.9254718532	925.47185320
2A	$96,379,000.00	1,001.98271677	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0019827168	1,001.98271677
CA1B	$91,785,000.00	949.48426508	0.00000000	0.00000000	0.00000000	0.00000000	13.96611026	0.9355181548	935.51815482
CA1B_GRP1	$79,737,000.00	941.54819707	0.00000000	0.00000000	0.00000000	0.00000000	16.07634386	0.9254718532	925.47185322
CA1B_GRP2	$12,048,000.00	1,002.00736056	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0020073606	1,002.00736056
CA1C	$91,785,000.00	949.48784649	0.00000000	0.00000000	0.00000000	0.00000000	13.96611026	0.9355217362	935.52173623
CA1C_GRP1	$79,737,000.00	941.54819707	0.00000000	0.00000000	0.00000000	0.00000000	16.07634386	0.9254718532	925.47185322
CA1C_GRP2	$12,048,000.00	1,002.03464475	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0020346448	1,002.03464475
1XPPP	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
1XPPP_NOTIONAL	$878,635,811.00	946.81769465	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.9318569718	931.85697183
1XPPP_PRINCIPAL	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Principal Factors Report (Continued)
Class	Original Scheduled Balance	Beginning Principal/Notional Balance	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal	Ending Principal/Notional Balance Percent	Ending Principal/Notional Balance
1X2	$65,082,546.00	425.45970851	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.3492643482	349.26434823
2XPPP	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
2XPPP_NOTIONAL	$132,754,877.00	1,004.86701931	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0069102671	1,006.91026711
2XPPP_PRINCIPAL	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
B1	$16,688,000.00	999.00439717	0.00000000	0.00000000	0.00000000	0.00000000	0.00051894	0.9990038782	999.00387824
B2	$17,193,000.00	999.00529227	0.00000000	0.00000000	0.00000000	0.00000000	0.00051882	0.9990047735	999.00477345
B3	$6,068,000.00	999.00618820	0.00000000	0.00000000	0.00000000	0.00000000	0.00051912	0.9990056691	999.00566908
B4	$7,079,000.00	999.00887413	0.00000000	0.00000000	0.00000000	0.00000000	0.00051843	0.9990083557	999.00835570
B5	$6,068,000.00	999.01066579	0.00000000	0.00000000	0.00000000	0.00000000	0.00051912	0.9990101467	999.01014667
B6	$4,045,000.00	999.01513968	0.00000000	0.00000000	0.00000000	0.00000000	0.00051916	0.9990146205	999.01462052
B7	$4,045,000.00	999.03662794	0.00000000	0.00000000	0.00000000	0.00000000	0.00051916	0.9990361088	999.03610878
B8	$3,034,000.00	999.05453527	0.00000000	0.00000000	0.00000000	0.00000000	0.00051747	0.9990540178	999.05401780
B9	$4,045,000.00	999.08139431	0.00000000	0.00000000	0.00000000	0.00000000	0.00051916	0.9990808752	999.08087515

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Principal Factors Report (Continued)
Class	Original Scheduled Balance	Beginning Principal/Notional Balance	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal	Ending Principal/Notional Balance Percent	Ending Principal/Notional Balance
B10	$7,585,000.00	999.08139486	0.00000000	0.00000000	0.00000000	0.00000000	0.00051945	0.9990808754	999.08087541
B11	$4,045,000.00	999.08139431	0.00000000	0.00000000	0.00000000	0.00000000	0.00051916	0.9990808752	999.08087515
B12	$3,034,000.00	999.08139750	0.00000000	0.00000000	0.00000000	0.00000000	0.00051747	0.9990808800	999.08088003
B13	$3,034,000.00	999.08139750	0.00000000	0.00000000	0.00000000	0.00000000	0.00051747	0.9990808800	999.08088003
B14	$7,591,589.71	999.08139266	0.00000000	0.00000000	0.00000000	0.00000000	0.00051900	0.9990808737	999.08087367
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
TFEE	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Interest Factors Report
Class	Original Balance	Interest Rate Accrued	Interest Rate Paid	Current Month Interest Accrued	Prepayment Interest Shortfall	Relief Act Interest Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Deferred Interest	Total Interest Distribution	Total Carryforward Amount Remaining
1A	$637,887,000.00	5.7141600000%	5.7141600000%	4.48346420	0.00000000	0.00000000	0.00000000	0.00000009	0.00000000	0.00000000	0.00000000	4.48346430	0.00000000
2A	$96,379,000.00	5.6260000000%	5.6260000000%	4.69762894	0.00000000	0.00000000	0.00000000	0.00000010	0.00000000	0.00000000	0.00000000	4.69762905	0.00000000
CA1B	$91,785,000.00	5.5000000000%	5.5000000000%	4.35180291	0.00000000	0.00000000	0.00000000	0.00000011	0.00000000	0.00000000	0.00000000	4.35180302	0.00000000
CA1B_GRP1	$79,737,000.00	5.5000000000%	5.5000000000%	4.31542922	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.31542922	0.00000000
CA1B_GRP2	$12,048,000.00	5.5000000000%	5.5000000000%	4.59253403	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.59253403	0.00000000
CA1C	$91,785,000.00	5.5400000000%	5.5400000000%	4.38346887	0.00000000	0.00000000	0.00000000	0.00000011	0.00000000	0.00000000	0.00000000	4.38346898	0.00000000
CA1C_GRP1	$79,737,000.00	5.5400000000%	5.5400000000%	4.34681415	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.34681415	0.00000000
CA1C_GRP2	$12,048,000.00	5.5400000000%	5.5400000000%	4.62605993	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.62605993	0.00000000
1XPPP	$0.00	1890.0341622810%	1085.9553012625%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
1XPPP_NOTIONAL	$878,635,811.00	0.7413949655%	0.4259826670%	0.58497156	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.33610661	0.00000000
1XPPP_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Interest Factors Report (Continued)
Class	Original Balance	Interest Rate Accrued	Interest Rate Paid	Current Month Interest Accrued	Prepayment Interest Shortfall	Relief Act Interest Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Deferred Interest	Total Interest Distribution	Total Carryforward Amount Remaining
1X2	$65,082,546.00	1.2695345320%	1.2695345320%	0.45011315	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.45011315	0.00000000
2XPPP	$0.00	1314.3621575816%	50.5288789587%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
2XPPP_NOTIONAL	$132,754,877.00	0.4913792886%	0.0188904135%	0.41147573	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.01581863	0.00000000
2XPPP_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
B1	$16,688,000.00	5.6600000000%	5.6600000000%	4.71197088	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.71197088	0.00000000
B2	$17,193,000.00	5.6700000000%	5.6700000000%	4.72030012	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.72030012	0.00000000
B3	$6,068,000.00	5.6800000000%	5.6800000000%	4.72862887	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.72862887	0.00000000
B4	$7,079,000.00	5.7100000000%	5.7100000000%	4.75361774	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.75361774	0.00000000
B5	$6,068,000.00	5.7300000000%	5.7300000000%	4.77027521	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.77027521	0.00000000
B6	$4,045,000.00	5.7800000000%	5.7800000000%	4.81192336	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.81192336	0.00000000
B7	$4,045,000.00	6.0200000000%	6.0200000000%	5.01183436	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.01183436	0.00000000
B8	$3,034,000.00	6.2200000000%	6.2200000000%	5.17843111	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.17843111	0.00000000
B9	$4,045,000.00	6.3978774280%	6.5199987022%	5.32666749	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.10167614	0.00000000	5.42834116	0.00000000

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Interest Factors Report (Continued)
Class	Original Balance	Interest Rate Accrued	Interest Rate Paid	Current Month Interest Accrued	Prepayment Interest Shortfall	Relief Act Interest Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Deferred Interest	Total Interest Distribution	Total Carryforward Amount Remaining
B10	$7,585,000.00	6.3978774280%	6.5200006443%	5.32666711	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.10167568	0.00000000	5.42834278	0.00000000
B11	$4,045,000.00	6.3978774280%	6.5199987022%	5.32666749	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.10167614	0.00000000	5.42834116	0.00000000
B12	$3,034,000.00	6.3978774280%	6.5199998353%	5.32666777	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.10167436	0.00000000	5.42834212	0.00000000
B13	$3,034,000.00	6.3978774280%	6.5199998353%	5.32666777	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.10167436	0.00000000	5.42834212	0.00000000
B14	$7,591,589.71	6.3978774280%	6.5200178716%	5.32666695	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.10169016	0.00000000	5.42835711	0.00000527
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
TFEE	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Pool 8063
LOAN COUNT
Original Loan Count	62
Beginning Loan Count	31
Loans Added	0
Loans Prepaid-in-full	6
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	25
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$65,082,546.44
Beginning Scheduled Principal Balance	$27,690,001.05
Scheduled Principal Received or Advanced	($80,827.15)
Unscheduled Principal	$18,269.97
Prepayments-in-full	$5,021,545.22

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Pool 8063 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$22,731,013.01
INTEREST
Accrued Interest at Gross Rate	$179,028.21
Unscheduled Interest	$0.04
Uncollected Interest	($4,992.42)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Pool 8063 (Continued)
FEES
Servicing Fees	$8,653.12
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$0.00
Other	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Pool 8064
LOAN COUNT
Original Loan Count	1473
Beginning Loan Count	1456
Loans Added	0
Loans Prepaid-in-full	16
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	1440
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$813,553,265.35
Beginning Scheduled Principal Balance	$804,217,931.96
Scheduled Principal Received or Advanced	($2,708,554.13)
Unscheduled Principal	$1,096,596.35
Prepayments-in-full	$9,797,996.57

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Pool 8064 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$796,031,893.17
INTEREST
Accrued Interest at Gross Rate	$5,198,700.36
Unscheduled Interest	$0.03
Uncollected Interest	($8,066.67)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Pool 8064 (Continued)
FEES
Servicing Fees	$874,943.68
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$946.80
Other	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Pool 8065
LOAN COUNT
Original Loan Count	260
Beginning Loan Count	260
Loans Added	0
Loans Prepaid-in-full	1
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	259
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$132,754,877.92
Beginning Scheduled Principal Balance	$133,400,997.55
Scheduled Principal Received or Advanced	($414,699.16)
Unscheduled Principal	$37,850.27
Prepayments-in-full	$105,597.78

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Pool 8065 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$133,672,248.66
INTEREST
Accrued Interest at Gross Rate	$816,126.80
Unscheduled Interest	$0.03
Uncollected Interest	($197.13)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Pool 8065 (Continued)
FEES
Servicing Fees	$135,114.75
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$2,100.00
Other	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Group 1
LOAN COUNT
Original Loan Count	1795
Beginning Loan Count	1747
Loans Added	0
Loans Prepaid-in-full	23
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	1724
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$1,011,390,689.71
Beginning Scheduled Principal Balance	$965,308,930.56
Scheduled Principal Received or Advanced	($3,204,080.44)
Unscheduled Principal	$1,152,716.59
Prepayments-in-full	$14,925,139.57

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Group 1 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$952,435,154.84
INTEREST
Accrued Interest at Gross Rate	$6,193,855.37
Unscheduled Interest	$0.10
Uncollected Interest	($13,256.22)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Group 1 (Continued)
FEES
Servicing Fees	$1,018,711.55
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$3,046.80
Other	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Total
LOAN COUNT
Original Loan Count	1795
Beginning Loan Count	1747
Loans Added	0
Loans Prepaid-in-full	23
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	1724
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$1,011,390,689.71
Beginning Scheduled Principal Balance	$965,308,930.56
Scheduled Principal Received or Advanced	($3,204,080.44)
Unscheduled Principal	$1,152,716.59
Prepayments-in-full	$14,925,139.57

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Total (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$952,435,154.84
INTEREST
Accrued Interest at Gross Rate	$6,193,855.37
Unscheduled Interest	$0.10
Uncollected Interest	($13,256.22)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Collateral Report Total (Continued)
FEES
Servicing Fees	$1,018,711.55
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$3,046.80
Other	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Delinquency Information by Group*
Group ID	1 Month Count	Scheduled Ending Balance	2 Months Count	Scheduled Ending Balance	3 Months Count	Scheduled Ending Balance	4+ Months Count	Scheduled Ending Balance
Pool 8063	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Pool 8064	19	$12,821,183.97	6	$3,244,003.23	0	$0.00	0	$0.00
Pool 8065	5	$4,040,637.39	1	$1,012,427.94	0	$0.00	0	$0.00
Group 1	24	$16,861,821.36	7	$4,256,431.17	0	$0.00	0	$0.00
Aggregate	24	$16,861,821.36	7	$4,256,431.17	0	$0.00	0	$0.00

* Does not include mortgage loans in foreclosure or REO.

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Foreclosure, REO, and Bankruptcy by Group**
Group ID	Foreclosure Count	Scheduled Ending Balance	REO Count	Scheduled Ending Balance	Bankruptcy Count	Scheduled Ending Balance
Pool 8063	0	$0.00	0	$0.00	0	$0.00
Pool 8064	1	$330,904.41	0	$0.00	0	$0.00
Pool 8065	0	$0.00	0	$0.00	0	$0.00
Group 1	1	$330,904.41	0	$0.00	0	$0.00
Aggregate	1	$330,904.41	0	$0.00	0	$0.00

** Loans in Bankruptcy will also be reflected under their applicable delinquency or foreclosure status.

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Aggregate Loss Amount by Group
Group ID	Count	Loss Amount
Pool 8063	0	$0.00
Pool 8064	0	$0.00
Pool 8065	0	$0.00
Group 1	0	$0.00
Aggregate	0	$0.00

Servicer Advances by Group
Group	Count	Total
Pool 8063	21	$60,373.33
Pool 8064	1182	$1,379,382.30
Pool 8065	214	$239,592.44
Group 1	1417	$1,679,348.07
Aggregate	1417	$1,679,348.07

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Stop Advances Loans
Group	Count	Loan Balance	Total Scheduled P&I
Pool 8063	0	$0.00	$0.00
Pool 8064	0	$0.00	$0.00
Pool 8065	0	$0.00	$0.00
Group 1	0	$0.00	$0.00
Aggregate	0	$0.00	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Delinquency Roll Rates-Aggregate***
Current Value	Current		1 Month		2 Months		3 Months
Prior Value	Count	Balance	Count	Balance	Count	Balance	Count	Balance
Current	1656	$912,910,367.79	17	$9,396,445.24	0	$0.00	0	$0.00
Delq 1 Month	32	$17,037,757.68	7	$7,465,376.12	6	$4,037,385.75	0	$0.00
Delq 2 Month	3	$879,799.78	0	$0.00	0	$0.00	0	$0.00
Delq 3 Month	1	$158,072.65	0	$0.00	1	$219,045.42	0	$0.00
Delq 4 Month	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Foreclosure	0	$0.00	0	$0.00	0	$0.00	0	$0.00

Current Value	4+ Months		Foreclosure		REO
Prior Value	Count	Balance	Count	Balance	Count	Balance
Current	0	$0.00	0	$0.00	0	$0.00
Delq 1 Month	0	$0.00	0	$0.00	0	$0.00
Delq 2 Month	0	$0.00	1	$330,904.41	0	$0.00
Delq 3 Month	0	$0.00	0	$0.00	0	$0.00
Delq 4 Month	0	$0.00	0	$0.00	0	$0.00
Foreclosure	0	$0.00	0	$0.00	0	$0.00

*** To use this chart, locate along the Current Value row the desired delinquency status as of the immediately preceding due date (e.g. Current, 1 Month delinquent, etc.). Use the left hand column labeled Prior Value to see the prior month's value. Follow the selected Current Value column to the desired Prior Value row.

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Credit Enhancement
Type	Original Balance	Beginning Balance	Reduction	Increase	Ending Balance
Interest Coverage Account	$2,886,072.39	$0.00	$0.00	$0.00	$0.00
Over Collateralization	$0.00	$0.00	$0.00	$0.00	$0.00
Reserve Account	$0.00	$0.00	$0.00	$0.00	$0.00
Other	$0.00	$0.00	$0.00	$0.00	$0.00

Insurance
Insurance Type	Original Balance	Claims Paid	Coverage Remaining
Pool Insurance	$0.00	$0.00	$0.00
Other	$0.00	$0.00	$0.00

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Subordinate Class Certificate Balances
The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6,B7,B8,B9,B10,B11,B12,B13,B14 Certificates immediately after the principal and interest distribution on 05/25/2007 are as follows:
Class	Ending Principal Balance	Percentage of Aggregate Certificate Principal Balance on Closing Date	Percentage of Aggregate Certificate Ending Principal Balance
B1	$16,671,376.72	1.65%	1.75%
B2	$17,175,889.07	1.70%	1.80%
B3	$6,061,966.40	0.60%	0.64%
B4	$7,071,980.15	0.70%	0.74%
B5	$6,061,993.57	0.60%	0.64%
B6	$4,041,014.14	0.40%	0.42%
B7	$4,041,101.06	0.40%	0.42%
B8	$3,031,129.89	0.30%	0.32%
B9	$4,041,282.14	0.40%	0.42%
B10	$7,578,028.44	0.75%	0.80%
B11	$4,041,282.14	0.40%	0.42%
B12	$3,031,211.39	0.30%	0.32%

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Subordinate Class Certificate Balances
The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6,B7,B8,B9,B10,B11,B12,B13,B14 Certificates immediately after the principal and interest distribution on 05/25/2007 are as follows:
Class	Ending Principal Balance	Percentage of Aggregate Certificate Principal Balance on Closing Date	Percentage of Aggregate Certificate Ending Principal Balance
B13	$3,031,211.39	0.30%	0.32%
B14	$7,584,612.08	0.75%	0.80%
Total	$93,464,078.58	9.25%	9.81%

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Glossary of Terms
TERM	DEFINITION
Average Ending Scheduled Principal Balance	Average scheduled principal balance of all mortgage loans as of the immediately preceding due date.
Compensating Interest	Interest paid by the servicer or master servicer in respect of Prepayment Interest Shortfall, subject to specified caps.
CPR (Constant Prepayment Rate)	The annualized, compounded single month mortality rate.
Current Interest Accrued	The interest accrued for the current month's distribution.
Deferred Interest	When a scheduled monthly payment is less than required to satisfy the note rate, the unpaid interest is deferred by adding it to the loan balance and the certificate balances.
Excess Liquidation Proceeds	Funds received at the time of liquidation in excess of the amount needed to satisfy the outstanding scheduled principal balance and related expenses.
Interest Rate Accrued	The rate at which interest is accrued for the current month's distribution.
Interest Rate Paid	The rate at which interest is paid for the current month's distribution.
Uncollected Interest	Interest not collected on delinquent loans for which scheduled payments are no longer being advanced, interest uncollected on prepayments and interest uncollected on liquidations.
Other Interest Shortfall	Any interest shortfall other than Uncompensated Interest Shortfall, Deferred Interest or Interest Uncollected on Non-Earning Assets.
Over Collateralization	Any excess of the aggregate principal balance of the mortgage loans over the aggregate principal balance of the certificates.
Prefunding Amount	The amount of cash being held for future loan purchases.

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Glossary of Terms (Continued)
TERM	DEFINITION
Prepayment Interest Shortfall	Any shortfall in collections of interest on mortgage loans resulting from prepayments in full or partial prepayments.
Principal Loss	The amount of principal reduction due to a loss realized on the mortgage loans.
Principal Reimbursed	The amount of principal passed through as a reimbursement.
PSA (Prepayment Speed Assumption)	A prepayment model that in its base case (stated as 100% PSA), assumes that prepayments start in month one at an annual CPR of 0.2%, rising linearly to 6.0% CPR in month 30, and then remain flat at 6.0% CPR thereafter.
Relief Act Shortfall	Interest shortfall resulting from application of the Servicemembers Civil Relief Act.
REO (Real Estate Owned)	Property acquired by the trust through foreclosure or deed-in-lieu of foreclosure on a defaulted loan.
Reserve Account	Funded or non-funded accounts set up at either the property or portfolio level in in anticipation of periodic or non-periodic capital expenditures or cash needs.
Servicer Advances	Scheduled principal and interest advances made by the servicer or master servicer for delinquent mortgage loans.
Servicing Fees	The monthly fee paid to the servicer to perform primary servicing function for the master servicer with respect to the mortgage loans and if applicable the fee charged by the master servicer for supervising the mortgage loan servicing.
SMM (Single Month Mortality)	In any given month, the SMM measures the percentage of the beginning pool balance that was paid back earlier than scheduled through payoffs.
Stop Advance	The amount of principal and interest on delinquent mortgage loans for which scheduled payments are no longer being advanced.
Subsequent Recoveries	The amount of funds recovered on mortgage loans that were previously liquidated at a loss.
Trigger Event	An event that may require a change in payment priority.

Series: WAMU 2007-OA2	Washington Mutual
Issue Date: 02/22/2007
Record Date: 04/30/2007
Distribution Date: 05/25/2007

Glossary of Terms (Continued)
TERM	DEFINITION
Unscheduled Interest	Interested collected in addition to the scheduled interest payment.
Unscheduled Principal	Payments of principal which were received with respect to any mortgage loan during the prior period, other than monthly scheduled principal, prepayments in full, repurchases, liquidation principal and subsequent recoveries.
Weighted Average Loan Age	For any distribution date, the weighted average of the loan age on the mortgage loans as of the immediately preceding due date.
Weighted Average Mortgage Interest Rate	For any distribution date, the weighted average of the mortgage interest rates on the mortgage loans as of the second preceding due date (after giving effect to the payments due on the mortgage loans on that due date).
Weighted Average Pass Through Rate	For any distribution date, the weighted average of the pass-through rates on the mortgage loans as of the second preceding due date (after giving effect to the payments due on the mortgage loans on that due date).
Weighted Average Remaining Term	For any distribution date, the weighted average of the maturity on the mortgage loans as of the immediately preceding due date.
MBA Delinquency Calculation	In this calculation, a loan increases its delinquency status if a monthly payment is not received by the end of the day immediately preceding the loan's next due date.
OTS Delinquency Calculation	In this calculation, a loan increases its delinquency status if a monthly payment is not received by the loan's due date in the following month.

WaMu Mortgage Pass-Through Certificates, Series 2007-OA2 10-D