@morrow without logs this will be hard to track down. can you ask your administrator to open up a support case for this?
Using the zarafa-admin tool you can modify user information.
Log on to the Zarafa server using PuTTY (or another SSH client) or directly with a console and give the following command:
zarafa-admin -u <username> [-U <new username>] [-p <new password>]
The settings between [ ] are optional and can be used to modify the following properties:
-U <new username>
Modify a users username.
-p <new password>
Modify a users password.
Modify a users primary email address.
-f <full name>
Modify a users full name.
With this option you can set whether a user is an administrator. 0 disables admin rights, 1 enables admin rights.
If you don’t know the exact username in Zarafa, you can view all users by giving the following command: