I did work, but suddenly, no mails was sync to he's iphone 5c..
I have tryed the following:

Removed the device
Resync the device
Removed user in GroupWise Mobility Service, and add the user again
Updated GroupWise Mobility Service, to latest version
Tried User account on Iphone 4 s, same problem
Tried giving user new password, to novell client and groupwise and resync...
I can login to the GroupWise Mobility Service as the user..
The user can send but not received any mails......

What to do ? No other user has the same problem.....