Imap contacts not visible and not synced from server to client

[Vladimir Starikov]

Hello.

After update to Kolab 3.3 IMAP contacts are not showing in Roundcube and 
not synced from server to client over Exchange Activesyng. Xml files 
containing the contacts are still in the 'Contacts' folder of each user, 
and contacts created in Roundcube or Android/iPhone are synced up to the 
server (xml files appear), but the new contacts also are not shown anywhere.

What could be a problem? I have checked all configuration files 
mentioned in update manuals, compared them with a new Kolab installation 
(with working contacts) - no result.

With best regards,
Vladimir.