we would like to use ZIMBRA in the whole company and it would
probably be much easier to convince the users if there would be
able to use their old mail client like Mutt, OE, Tunderbird as well.

Can ZIMBRA serve als an IMAP4 server? (it would be already
ok, if mails sent with a mail-client would be listed in the ZIMBRA-

Thank's for your tips!