On Sun, 2010-08-29 at 17:07 +0200, Cor Bosman wrote:

Hi all, anyone know if it's safe to mix a 1.2 environment with 2.0 servers? Im planning on adding some 2.0 servers for test purposes, but now im wondering if thats going to mess up index files or other files for users selecting the test server and then switching back to our normal servers.

As long as you're not using dsync to do mirroring you should be fine (two-way mirroring requires dovecot.mailbox.log that contains changes such as mailbox deletions etc.)