[Dovecot] Upgrade 1.0->1.2

[Ivica Glavocic]

Hi all

We are planning to upgrade Dovecot from production version 1.0.10 to 
latest version 1.2.9
Users are using maildir style mailboxes with ~20 GB of messages on 
SLES10 server.

Upgrade will be done by installing new server and then migrating 
mailboxes from old on new server.

Since dovecot-uidlist file have new format and index files have changed 
in v1.1, what must be done to have new Dovecot v1.2 working properly 
with old v1.0 maildirs?

Thanks, regards

Ivica Glavocic