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Exhibit 99.1

[HOULIHAN SMITH & COMPANY INC. LETTERHEAD]

November 13, 2007

Board of Directors
PROS Holdings, Inc.
3100 Main Street, Suite #900
Houston, TX 77002-9319

RE: Valuation of PROS Holdings, Inc.

Dear Gentlemen:

Enclosed is our manually signed consent relating to the use of our valuation report ("Valuation Report") in conjunction with your supplemental submission to the SEC. It is understood that our Valuation Report will not be included in the body (or exhibit) of the Registration Statement on Form S-1 to be filed on or about November 14, 2007 (as may be amended, the "Registration Statement") of PROS Holdings, Inc. (the "Company" or "PROS").

We hereby consent to the inclusion in the Registration Statement for the registration of shares of PROS common stock of references to our final report relating to the estimation of fair value of the common stock of the Company as of February 28, 2007 and to references to our firm's name therein. We further consent to the filing of this letter as an exhibit to the Registration Statement." Please provide us with an exact copy of the Registration Statement as filed with the SEC.

Sincerely,

/s/ Houlihan Smith & Company, Inc.

Houlihan Smith & Company, Inc.

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Exhibit 99.1