Securities and Exchange Commission

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):

July 5, 2005

MICROMUSE INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware

(State or Other Jurisdiction of Incorporation)


000-23783		943288385
(Commission File Number)		(IRS Employer Identification Number)

139 Townsend Street

San Francisco, California 94107

(Address of Principal Executive Offices, Including Zip Code)

(415) 343-7600

(Registrant’s Telephone Number, Including Area Code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

ITEM 7.01 REGULATION FD DISCLOSURE.

On July 5, 2005, Micromuse Inc. issued a press release, a copy of which is furnished as Exhibit 99.1, announcing that it has reached an agreement with Agilent Technologies, Inc. to settle two patent infringement lawsuits entitled Agilent Technologies, Inc. v. Micromuse Inc., Case No. 1:04-cv-3090 (RWS), and Micromuse Inc. v. Agilent Technologies, Inc., Case No. 05-cv-00893 (RWS), both of which are pending in the U.S. District Court for the Southern District of New York.

ITEM 9.01 FINANCIAL STATEMENTS AND EXHIBITS.

(a)

Not applicable.

(b)

Not applicable.

(c)

Exhibit:

99.1

Press Release dated July 5, 2005 of the Registrant.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.


	MICROMUSE INC.
	(Registrant)

Date: July 5, 2005

	By:	/s/ Nell O’Donnell
	Name:	Nell O’Donnell
	Title:	Senior Vice President and Secretary

EXHIBIT INDEX


Number		Description
99.1		Press Release dated July 5, 2005 of the Registrant.

MICROMUSE INC 8-K