I wouldn't think they could have deleted all of their calendar entries that easily.
I've been going through my application event log to see if there are any smoking guns. I found the following (the last one seems like it might be the most relevant) Source: MSExchange IS Mailbox Event ID: 1147 Category: Rules Error 1245 while disabling rule on public folder with rule ID 1-58F827. The folder ID of the public folder is in the data section of this event. We don't use public folders so this seems an unlikely problem. Source: Userenv Event ID: 1517 Windows saved user ANSCI\AEDon on registry while an application or service was still using the registry during log off. The memory used by the user's registry has not been freed. The registry will be unloaded when it is no longer in use. AEDon is not one of the accounts that is having problems with deleted messages. A few days ago there were a bunch of messages like this Source: MSExchangeIS Mailbox Category: Views Event ID: 1173 Type: Warning Error 0x6bb deleting unused restricted views from folder 1-266CC1E on database "Storage Group 2\Mailbox Store". Microsoft Exchange Information Sore will try to delete the view again at the next maintenance interval. Both users reporting problems were in Storage Group 2. Thanks for any help you can provide. Curt From: [email protected] [mailto:[email protected]] On Behalf Of John Cook Sent: Wednesday, June 12, 2013 9:36 AM To: [email protected] Subject: [Exchange] RE: Mail Disappearing People "accidentally" delete things on mobile devices all the time, it only takes a slightly off keystroke or swipe of the finger to do so on such a small screen. John W. Cook Network Operations Manager Partnership For Strong Families 5950 NW 1st Place Gainesville, Fl 32607 Office (352) 244-1610 Cell (352) 215-6944 MCSE, MCP+I, MCTS, CompTIA A+, N+, VSP4, VTSP4 From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Curt Finley Sent: Wednesday, June 12, 2013 12:17 PM To: [email protected]<mailto:[email protected]> Subject: [Exchange] RE: Mail Disappearing No delegates (I assume you are talking about the kind that can access another person's mailbox). By mobile devices - you're talking about something like a phone or are you talking about a laptop? The person who lost her calendar is definitely on a laptop. I don't recall if she has a phone or not. How would these devices cause problems? Curt From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of John Cook Sent: Wednesday, June 12, 2013 8:44 AM To: [email protected]<mailto:[email protected]> Subject: [Exchange] RE: Mail Disappearing Any mobile devices present? Delegates? John W. Cook Network Operations Manager Partnership For Strong Families 5950 NW 1st Place Gainesville, Fl 32607 Office (352) 244-1610 Cell (352) 215-6944 MCSE, MCP+I, MCTS, CompTIA A+, N+, VSP4, VTSP4 From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Curt Finley Sent: Wednesday, June 12, 2013 11:38 AM To: [email protected]<mailto:[email protected]> Subject: [Exchange] Mail Disappearing In the last couple of days I've had two users tell me they have had mail disappear. Any suggestions what might be happening? Mail store corrupt? I have Exchange 2003 where do I proceed from here? Thanks for your help. 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