zimbra 3 to zimbra 4 migration

[josefhr]

I've just installed zimbra 4 in the new server, and I am planning to migrate all users and mailbox from old zimbra 3 server to the new server (with zimbra 4 installed on it). Is there any tool to do that? I've read about imapsync, and I have tried it. But it need password from each users which is imposible for me.

[tbullock]

Have you thought about trying to use the "Upgrade" feature during Install rather than Installing a fresh copy and then migrating?

I have been moving my Open Source installation forward since Zimbra's early Beta released, and I have never used anything other than "Upgrade", and that includes moving from FC3 to FC5 on different servers.

[rsharpe]

If you need to keep the passwords the most seemless way to do it is install the same version on the new server. Copy over /opt/zimbra from the old server then upgrade to 4.

Or upgrade the old server to 4 install 4 on the new one and then copy /opt/zimbra.

If passwords aren't required imapsync is the nicest way.