My search-logic brain isn't working yet this am so I can't come up with a reference for you, but your problem is that the 5.x installers won't upgrade in a single bound from that old a version of 4. I think (but can't remember) that the oldest version of 4.x.x from which you can upgrade to 5.x is 4.5.7.
In any case, you can upgrade from your current version to 4.5.11 which is downloadable, and then go from there to 5.0.2 and you should have smooth sailing. No need to jump through all the other versions stepwise; just get onto a later 4 and then fire off 5.
Don't forget to take a full backup of /opt/zimbra before each upgrade!
Cheers,
Dan |