Outlook 2003 (fully updated)
Windows XP Professional (fully updated)

I can create new contacts. I can edit any contact (even the ones that I can't delete or move). All I get is the cryptic "Can't move the item" error or the even more cryptic "The messaging interface has returned an unknown error. If the problem persists, restart Outlook."

I can not find anything in common between the contacts that can be moved or deleted or the contacts that can't be moved or deleted.

I have run scanpst but there are no errors.