I've gone through an upgrade from version 3.1.x to version 4.0.x on CentOS 4, but I don't think it was the exact versions you mention. This upgrade was simple, straightforward, and painless. My question to you, though, is why are you only upgrading to version 4.0.3? The current version of Zimbra is 4.5.5. You really should consider upgrading to this latest version. |