*UPDATED*ZCS 4.5.8 Open Source Edition

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Zimbra Collaboration Suite 4.5.8 is an optional upgrade for Open Source users. The only change in this version is the license update and there are no bugs that have been fixed in this release.

For more information on the License, see here:
http://www.zimbra.com/license/

Because this is an optional upgrade, users can upgrade to 4.5.8 or wait until 4.5.9 is released. There will not be a 4.5.8 for the Network Edition of Zimbra.

We sincerely hope this clears up the confusion.
----------------UPDATE----------------
We discovered that there was one more fix that slipped into this build. That's bug: Bug 17977 - Server Status in admin console shows incorrect info.
Also, another issue was discovered where users using 4.5.8 cannot upgrade to RC1. If you're running 4.5.8, please do not attempt to upgrade to RC1 as it will fail. RC2 will fix this issue.
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-The Zimbra Team

http://www.zimbra.com/community/downloads.html