5

Open-Xchange nabs $9 million to fight Exchange

http://news.cnet.com

Open-source email company Open-Xchange has raised a $9 million Series B round in a difficult financing environment, bringing its total funding to $17.8 million. With this fresh infusion of cash Open-Xchange is expected to mount a more serious challenge to Microsoft's ubiquitous Exchange product. Open-Xchange claims 8.4 million paid mailboxes worldwide.

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7

PostPath: Enterprise-strength open source alternative for Exchange

http://www.linux.com

For enterprise system administrators looking for interoperability with Microsoft Exchange, but not the high costs associated with it, PostPath email and collaboration server could be a smart business investment.

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5

New Scalix open source groupware is competition for Microsoft Exchange

http://www.linux.com

Scalix collaboration platform, with its latest release version 11.4, aims to be a good alternative to Microsoft Exchange.

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