[Dovecot] mirate to dovecot 2.0.13

Hi,

I have in my system dovecot 1.2.11 and i want migrate to dovecot 2.0.13. I have 2 Frontend that proxy all request to Backend and i want migrate first FE and after the BE.

Can i install dovecot 2.0.13 in FE that proxy all request to BE with dovecot 1.2.11?

Thanks