Quote:
Originally Posted by vavai CMIIW, Thread starter mention this to Zimbra Desktop, not Zimbra Mail Server, isn't it ? |
You're not wrong and the original thread was posted in the Zimbra Desktop forum.

I've moved it.
To answer the original question, you should not downgrade ZCS either. The correct method would be to take a backup before the upgrade and if that has problems, remove the upgrade with './install.sh -u' the re-install the same version of Zimbra that was installed before the upgrade then restore your data to that. This has already been covered in the forums.