Zimbra, the open-source e-mail software that Yahoo acquired for $350 million last year, is officially coming to Ubuntu Linux.

Ubuntu users have been able to access Zimbra for the past year. But now, the e-mail software will be in the Ubuntu Partner Repository, providing easy access to both offline and online Yahoo Mail, Gmail, AOL Mail, and any IMAP or POP e-mail accounts. Zimbra also offers document and spreadsheet functions, as well as mashup features with services like Flickr, Amazon.com, and Yahoo Maps.

Offline e-mail and documents are one area where Yahoo has beaten Google to the punch–but there have been strong hints that engineers at the latter may be rolling out something similar soon through Gears.

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