Check this: If your iPhone (running firmware 2.2.1) has an Exchange account configured, make sure you have 2 messages in your Inbox. Open 1 of these messages and leave it open on your iPhone. Now, move this message to another folder using Outlook (I used my BlackBerry) and check your iPhone. You’ll see it has the remaining message open, but with the Sender and Subject of the old message (the one you moved)!