How can I enable logging on a mailbox to monitor what is changing the modified date of items? I have a user who uses auto-archive to delete items in specific folders every 14 days. He receives a lot of email and requires this to work to keep his mailbox under 2 GB. The modified date is changing at odd times and in bulk. It does not appear to be the antivirus or other scheduled events. He does have a Blackberry but clears all old items off his Blackberry almost every day (reconcile I read modifies the date). Regardless, he wants to know exactly what is modifying the date. Your help is most appreciated.