[Dovecot] Dovecot 1.1.x and 1.2.x differencies

[Veiko Kukk]

Hello,

I have been using successfully Dovecot 1.1.x for about a year now. It 
has been very stable.
Now I'm uprading that same system to newer and more powerful hardware 
and I was wondering whether it is good idea or not to switch to Dovecot 
1.2.x series. Could anybody direct me to feature comparision document or 
explain here main differences betweeen thos two branches?

-- 
Veiko