I have following error "Groupwise did not initialize successfully. Please run Groupwise Setup, or contact your system administrator. Unspecified error. OLE Error 80004005."

This happens only with one mailbox. When I use another username and password on that same PC, I can access that mailbox.
So I think there is a problem with the mailbox.
Any idea how I can recreate this mailbox? Or fix it? I'm coming from a Domino environment, so it's quit different.

Thanks in advance