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4.5.2 adds beta support for Ubuntu Network Edition as well as addressing many issues found in previous releases.
Notable items addressed include EST timezone problems, addition of a server based migration for pre-2007 time zone appointments, addition of BlackBerry Desktop Connector and help files for the lite client.
For a full list of items fixed please see the release notes and/or bugzilla.
Bugzilla
Wiki
Source
Zimbra Collaboration Suite 4.5.2 GA Released 
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