Two weeks ago, the user had several hundred sent items, and her incoming mail was either in her in box or was in the cabinet. Last week it disappeared. She has about 20 items in her Sent folder, all from the 18th or later. I've checked rules, cleanup, and filters. This has now happened to 3 different users. Any ideas of what could cause mail to vanish? How to keep it from happening? How to get it back? Any help is appreciated!