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The lowest number of users in a Zarafa Archiver license is 20.
@morrow without logs this will be hard to track down. can you ask your administrator to open up a support case for this?
@morrow hm.. sounds weird. do you have by any chance an error message in mail.app and the corresponding lines in gateway.log (log_level 6)?
@morrow IMAP Gateway. Have you tried deleting and readding the account? http://t.co/68oybADbtJ suggests that it might work.