EXHIBIT 23.6

                          CONSENT OF LEHMAN BROTHERS

   We hereby consent to the use of our opinion letter dated January 3, 2002 to
the Board of Directors of Talarian Corporation (the "Company") attached as
Annex C to the Registration Statement on Form S-4 of TIBCO Software Inc. (the
"Registration Statement") and to the references to our firm in the Registration
Statement under the headings "Summary", "Proposal No. 1--The Merger--Background
of the Merger", "Proposal No. 1--The Merger--Reasons for the Merger", "Proposal
No. 1--The Merger--Opinion of Financial Advisor to Talarian", "The Merger
Agreement--Representations and Warranties", "Annex A--Agreement and Plan of
Merger, dated as of January 4, 2002, by and among TIBCO Software Inc., Panther
Acquisition Corp. and Talarian Corporation" and "Annex C--Opinion of Lehman
Brothers Inc." In giving such consent, we do not admit that we come within the
category of persons whose consent is required under Section 7 of the Securities
Act of 1933, as amended, or the rules and regulations of the Securities and
Exchange Commission thereunder and we do not thereby admit that we are experts
with respect to any part of the Registration Statement under the meaning of the
term "expert" as used in the Securities Act.

                                          LEHMAN BROTHERS INC.


Menlo Park, California