Open-source challenge to Microsoft Exchange gains steam - 1 views
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An open-source, cloud-based e-mail alternative to Microsoft Exchange called Open-Xchange has signed up two new service providers and predicts it will have 40 million users by the end of 2011.
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Open-Xchange has tripled its user base from 8 million to 24 million paid seats since 2008
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Open-Xchange has 7 million users in North America today, but says most of its 2011 growth will occur on this continent, in part due to new agreements with service providers Lunarpages of California and Cirrus Tech in Toronto.
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