Mail Problems

[krpa]

Hi   Can anyone help me with this problem, which I suspect is permission related.   When accessing mail through  MS Express I get - ERR Error locking your mailbox.   On the mail server - SendMail - I get  - cucipop: Error opening keith's mailbox.   Mail in my (and everyone elses) mailbox is not deleted after I pick it up and I thus end up with multiple copies of the same message.   Thanks   Keith