One of the sys admins at a customer attended me to the following problem and solution (Thanks Niek!)
RES Workspace Manager can be used to provide data to configure Outlook, when this is done the user normally gets his own mailbox and have to connect other mailboxes manually. But the User Settings – Outlook template doesn’t support this in the zero-profiling. To solve this problem the ‘HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem” should be added to the zero-profiling.
