Exhibit 32.2

Certification of the Chief Financial Officer Pursuant to

18 U.S.C. Section 1350,

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q of Tumbleweed Communications Corp. (the “Company”) for the quarterly period ended June 30, 2008 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Timothy G. Conley, as Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

(1) The Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 11, 2008

/s/ TIMOTHY G. CONLEY

Timothy G. Conley

Senior Vice President of Finance and

Chief Financial Officer

TUMBLEWEED COMMUNICATIONS CORP 10-Q