These excerpts taken from the RVBD 8-K filed Apr 30, 2009.
11. Subsequent Events
On January 20, 2009, The Company entered into an Agreement of Merger with Riverbed Technology, Inc. pursuant to which, upon the terms and subject to the conditions set forth therein; (a) Mazu became a wholly-owned subsidiary of Riverbed; and (b) Riverbed Technology, Inc: (i) acquired all of the outstanding securities of Mazu; (ii) made payments totaling approximately $25.0 million in cash promptly following the closing; and (iii) will potentially make payments totaling up to $22.0 million in cash based on achievement of certain bookings targets for the one-year period from April 1, 2009 through March 31, 2010. The closing of the Merger occurred on February 19, 2009.