Page 27 of the 6.0.2 release notes:
Quote:
The upgrade path to 6.0.x is ZCS systems at 5.0.2 or later can upgrade directly to 6.0.x.
If you are running a version earlier than 5.0.2, you must first upgrade to 5.0.2 or later before upgrading to ZCS 6.0.
Important: Upgrades from ZCS 5.0.19 or later 5.0.x releases to ZCS 6.0.0 or 6.0.1 will fail. We recommend customers running 5.0.19 or later 5.0.x releases upgrade to 6.02 or later 6.0.x releases when they choose to move to the 6.0.x series. (Bug 42609)
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About that last sentence, one thing to be aware of is that some versions of 5 are "newer" than some versions of 6, so you can't go from one to the other. mmorse has mentioned this in a couple places:
http://www.zimbra.com/forums/migrati...6-0-2-oss.html http://www.zimbra.com/forums/adminis...6-0-2-a-2.html
Also discussed at
Bug 42609 – Upgrade from 5.0.19 to 6.0.0 or 6.0.1 fails - slapadd import failed
In fact the issue also affects upgrades from 5.0.20 to 6.0.2 or 6.0.3 as mmorse notes.
However 6.0.4 will be "newer" than any current GA release of 5, so this particular issue shouldn't affect you.