Zimbra, an open-source alternative to Microsoft Exchange Server that was acquired by Yahoo this past September, has released version 5.0 of its collaboration suite. The upgrades are various and wide-reaching, with support finally here for the BlackBerry and several improvements made to Zimbra’s browser-based email client.

Zimbra has passed the 20,000 customers and 11M+ mailboxes marks. Companies can choose to run Zimbra by installing the company’s server package locally or paying a third party to host the software remotely.

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Labels: ajax, collaboration, microsoft, opensource, web_2.0, web_apps