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We also encourage you to explore all things Zimbra with our team and members of the community.
Beta 2 of the ZCS Appliance Network Edition contains ZCS 4.5.1 Network bits plus a few additional fixes. You can obtain a trial version of this release via the Zimbra website.
Beta1 users should read the release notes on how to upgrade to the current release.
Bugzilla
Wiki
Source
ZCS Appliance Beta 2 available 
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