On Aug 12, 2008, at 3:41 AM, Mathieu Kretchner wrote:

Database user ?
LDAP

Here is an other problem : we don't have uid/gid stored in our LDAP database. Do we have to configure dovecot with a dovecot specific user/group ?

Yes, one or more (for one you have mail_uid/gid settings with v1.1). See http://wiki.dovecot.org/UserIds

no problem
Mail DB ?
Cyrus maildir
You'll have to convert to standard maildir:
http://wiki.dovecot.org/Migration/Cyrus

Thanks for the url, I've already seen it before and the script cyrus2courrier seems good but we wonder why you didn't mention imapsync ? (maybe because for mass migration we must have a clear password file?)

Most importantly imapsync doesn't preserve message UIDs. cyrus2courier is also faster since it doesn't have to write all the mail data, just rename the files.

Capability ?
Sieve / Quota
On latest version (1.1.2 currently), no problem, but a newer/full rewrite to provide native sieve capability is in progress, which will provide much better control
High Performance without hacking conf files !
this is one of dovecots strongest points imo...

Indeed, we bench cyrus and dovecot from scratch and dovecot seems to be realy fast !

Benchmarking IMAP servers for real-world usage is a bit difficult. 
http://imapwiki.org/Benchmarking

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