[Dovecot] Upgrading from 2.0.x to 2.1.x

Hi,

A quick question: Are there any incompatibilities in config settings among versions 2.0.x and 2.1.x (and subsequently v2.2.x)?

That is, upgrading Dovecot 2.0.x to 2.1.x software, will also require changes of any config settings (as upgrading from v1.x to 2.0.x did)?

Thanks, Nick