Although it is not known how much was invested by Microsoft, a source claims that it was an add-on investment on a $46 million Series C that closed last summer.   Other investors that participated in Move’s Series C includes Comcast, Cisco Systems, Benchmark Capital, Hummer Winblad Venture Partners, and Steamboat Ventures.  Move is now valuated at around $150 million.

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This acquisition comes at a time that Google is gearing to develop further online office suite applications and when Microsoft is supposedly developing and testing online versions of Word, Excel, and PowerPoint as well. Yahoo! is now on the bandwagon and will bring Yahoo! new customers and be able to benefit from the open-source community in terms of email software development.

The Zimbra Collaboration Suite 4.5 is the current release by Zimbra, but with the announcement of the acquisition, version 5.0 will not be delayed.

For those who are current Zimbra customers or want to learn more about how the acquisition, there is a Q&A available and Network Edition Trial on the Zimbra website.

The company raised $30.5 million over the course of three rounds of funding from Benchmark Partners, Redpoint Ventures, Accel Capital, Sumitomo Corporation, and Duff Ackerman & Goodrich according to TechCrunch.