Comment 7 for bug 955673

I migrated both 10.04 systems by copying the functional /home folder to a new 12.04 Beta system.

I had Evolution installed on the 12.04 system and when run it converted the existing 10.04 Evolution user data and config to the 12.04 version of Evolution with the results as posted above.

Personally I always install a new Ubuntu release from fresh and then enable my separate /home partition. Any conversion to new structures is usually done smoothly with this method (a lot more smoothly than people doing any direct "Upgrade" from an existing working system if the last 8 years are any guide).