Best way to migrate from Kolab 3.0 to 3.3?

[Alan Miller]

I have a single-site, single-server installation still running on Kolab 
3.0 on CentOS, and I'd like to look at moving them up to 3.3. Rather 
than doing an upgrade (or 2 or more upgrades) given the changes between 
the versions, would I be better off setting up a new 3.3 server and 
recreating the accounts, then using imapsync to pull everything across? 
I do have (or can get) all of the relevant passwords and already have 
the imapsync mostly scripted from when they first moved onto Kolab.

Thanks for any suggestions,
Alan