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I know this has been posted before, and I've searched the forums to no avail. I just want a straight answer, not 'it's in the documentation that comes with zimbra'. Where EXACTLY can I find the documentation? I've gone through all the documents in the tar, and found nothing. Please, help.
Upgrade instructions are usually in the release notes. You'll find the link to them in the same message as the link to the downloads in the announcements forum.
Bugzilla
Wiki
Source
Upgrading Zimbra 
Linear Mode
