2.0 to 2.1 migration procedure

[David Wright]

I'm about to try out imapd-2.1.4 (as packaged by Henrique for Debian). I 
am currently running imapd-2.0.16 (custom-compiled) on a different 
machine. Can somone point me to tips for how to migrate my users and 
their mail? Do I just need to copy over the mailbox directory hierarchy 
and run reconstruct? Or do I also need to import and/or reconstruct the 
metadata?