Some of our users get the following error, by deleting e-mail in OWA and Outlook 2007:
"Some items can't be deleted. They were either moved, already deleted, or access was denied."
The same users can't receive any e-mail, not internal either external. After 24 hours you receive a message that the e-mail is not deliverd (Error: #4.4.7)
When you try to open a message in OWA which can't be deleted, you receive an error 404 for the user who can't receive e-mail and can't delete. Other e-mail can be opened without problems.
The user can send e-mails without problems.