I am currently running a mailserver with dovecot (maildir) and postfix.
Now one user has to sync his contacts and calendar with outlook and iOS using our service. The only way to do this seems to be with exchange, right?
I dont really want to change anything big in the existing setup since it is working really well. Is it possible to somehow integrate an Exchange / Sync service in this existing setup?
I already tried Z-Push with IMAP/CalDAV/CardDAV but it has not really worked reliable.
Or is there something else to consider? Outlook does not seem to support Cal/CardDAV out of the box.