On Thursday 26 January 2012 04:31:20 Gedalya wrote:
> I'm facing the need to migrate from a proprietary IMAP server to
> Dovecot. The migration must be as smooth and transparent as possible.

Ignoring the migration of individual mailboxes addressed in other replies, I 
trust you've met Perdition - very useful for this sort of situation,
        http://horms.net/projects/perdition/

to provide an IMAP "Server" (actually proxy) that knows where the real 
mailboxes are located, and directs connections accordingly. That way you can 
migrate mailboxes one-by-one as you've migrated them, helpful to test a few 
mailboxes first without affecting the bulk of users' mailboxes atall.

cheers,

Andrew.

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