>>> In any case I only have experience of dovecot and it's used in some 
>>> larger installs such as the old webmail.us, now 1&1 (I believe).  I 
>>> think your installation is probably large enough that you might want to 
>>> do a trial migration of a couple of accounts and see if migration is a 
>>> problem.  
>> I'm trying to migrate my own account from cyrus to dovecot with the 2
>> tools which seems to fit the most my needs :
>>
>> cyrus2courier :
>> Work fast and well but I must use cyrus2courier-1.5.ts and I have 2
>> problems with it : falg unseen (or seen if I want) for all e-mail / Sub
>> folders of Inbox are invisibles (I see them on the File System) !
>>
>> imapsync :
>> Must add a transition configuration to dovecot in order to have user
>> passdb file (or master user) but once done it's ok and work correctly.
>> I've just tested a transition and I'm happy to see it keeps all flags
>> (seen/unseen too) and timestamp but as cyrus2courier, I can't see my
>> inbox sub folders although I could see them (full) on the File System?
> 
> If you serve Outlook Clients and use imapsynv check that they don't see all
> mails with the same delivery date. There's a script on the imapsync website
> that fixes this problem.
> 
> [EMAIL PROTECTED]
> 

We are using thunderbird here, but I'm glad to have your advice.

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