Recently I have been trying to solve a problem for one user that randomly gets D107 errors on their calendar and I am wondering if it has to do with the proxy to that calendar. An assistant has access to the calendar. On a regular basis, that assistant will attach email from the assistant's account into an appointment item in the calendar of the user they have proxy access to. Everything seems to be fine then randomly many of the appointments disappear. A series of D107s show in the PO log then it seems to fix itself. I say that it fixes itself because there are no more D107s but there are no more calendar appointments either. They just go "poof". Maintenance shows nothing out of the ordinary. They only twist here, is that the assistant uses the GW client and the calendar owner uses the Outlook client. It "seems" that most of the items that go "poof" have these attachments?