POWER OF ATTORNEY			EXHIBIT 24

The undersigned, as a Section 16 reporting person of TIBCO Software Inc. (the
"Company"), hereby constitutes and appoints William Hughes and Laura
Malinasky and each of them, the undersigned's true and lawful attorney-in-fact
to:

1.	complete and execute Forms 3, 4 and 5 and other forms and all
 amendments thereto as such attorney-in-fact shall in his or her discretion
determine to be required or advisable pursuant to Section 16 of the Securities
 Exchange Act of 1934 (as amended) and the rules and regulations promulgated
 thereunder, or any successor laws and regulations, as a consequence of the
 undersigned's ownership, acquisition or disposition of securities of the
Company; and

2.	do all acts necessary in order to file such forms with the Securities
and Exchange Commission, any securities exchange or national association, the
 Company and such other person or agency as the attorney-in-fact shall deem
 appropriate.

The undersigned hereby ratifies and confirms all that said attorneys-in-fact
and agents shall do or cause to be done by virtue hereof.  The undersigned
 acknowledges that the foregoing attorneys-in-fact, in serving in such capacity
at the request of the undersigned, are not assuming, nor is the Company
assuming, any of the undersigned's responsibilities to comply with Section 16
of the Securities Exchange Act of 1934 (as amended).

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to
the undersigned's holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing
delivered to the Company and the foregoing attorneys-in-fact.


IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
 be executed as of this 15th day of April, 2005.


Signature:         /s/ Murat Sonmez

Print Name:  Murat Sonmez







Return a copy via facsimile to: 650-846-1016
Return the original to:	Laura Malinasky
	TIBCO Software Inc.
	3303 Hillview Ave.
	Palo Alto, CA 94304