None that I can think of, unless your user is periodically using an IMAP client which has a mis-configured Sent Items location?
From: Beckett, William (Bill) [mailto:[EMAIL PROTECTED] Sent: 22 September 2008 14:47 To: MS-Exchange Admin Issues Subject: Sent Items Weird issue. User running outlook 2007. They send items out but only a fraction of their sent items actually stay in the sent items folder. Some are there, some are not. We've checked the deleted items folder and they aren't there. Any reason why only some outgoing emails would be disappearing? ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~