We recently migrated to exchange 2013. Since then, I'm working on getting the final bugs worked out. These are both related to the Unread Mail folder in Outlook 2010 Client.
Issue 1: All users effected:
Cannot delete a mail item (simply highlight and click delete) from the Unread Mail folder. We get the error:
"The item cannot be deleted. It was either moved or already deleted, or access was denied".
If we go to the inbox and attempt to delete the item, no problem at all.
Issue 2: One user effected:
Items no longer show as read after they are opened.
Bonus Issue: Search folder seems slow and unresponsive.
A wise man is a fool, with a good memory.