@morrow without logs this will be hard to track down. can you ask your administrator to open up a support case for this?
I am using Active Directory for user information for Zarafa. With the commando ‘zarafa-admin –l’ can I retrieve a list with Zarafa users, however it is not possible for (certain) users to log in into the webaccess or Outlook, what is wrong?
In Active Directory it is possible to set, for every user on which computer he/she may login. For verification of the username and password of a user, a computer will bind to the Active Directory. When the name or ip-address is not in the list of computers, the username and password is not verified by the Active Directory. The same would happen when the name or ip-address of the Zarafa server is not available in the list of computers, so the user cannot login to Zarafa.
For checking/changing this, you can take the following steps: