I have one mailbox on my exchange 2007 server that is giving me crazy issues. Have roughly 60 mailboxes all of the others are working fine but this one user all mail inside the mailbox will duplicate, then mark itself as unread so his outlook client shows that he has 800 new emails, it downloads them, then next time it checks it realizes they are all duplicates then deletes all of them. When I go to the OWA to check his account all of his messages are marked as unread, i can click them or click mark as read, then about 15 minutes later i go back and they are all marked as unread again. I dont know what is causing this or how to go about fixing. I am not the greatest with exchange so please try to help me out. Any suggestions? Thanks

Are they running Outlook in cached mode? Do they have a smpartphone or PDA that's synching with their mailbox?[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

Yes they are in cached mode, and they have an iphone that syncs with the mailbox

All of this has been connected the same way for about 6 months working fine, then last friday his mailbox started doing this, only thing that happened was a restart of the exchange server

See if you can isolate it to a specific client. Turn off the iPhone and see if the problem stops. If not, shut down Outlook. If it's Outlook, I'd try taking him out of cached mode. If it quits doing it when he's not in cached mode, delete the cache file and let it rebuild a new one.[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

Ok I stopped the syncing with the Iphone, and turned off cached exchange mode, but still have the same issue. I think it is maybe something with the exchange server because all the emails in the OWA stay as unread so Outlook constantly thinks they are new even though they are 6 months old? Is there any way to rebuild a specific mailbox without losing all its data? Thanks

Have you got another mail store you can move it to? I've seen that clear up a lot of strange problems.[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

Create a mailbox, if you have an admin test account give it the new empty mailbox, create a folder in the “inbox” Export-Mailbox for the user’s mail to new mailbox, give it the name of the folder your created, delete the uses mailbox, and create a new mailbox for the user, Export-Mailbox to the uses new mailbox. It is messy but it works when I get a Corrupt Mailbox. Open the users mailbox and take take notes or screen shots. Export-Mailbox -Identity flast -TargetMailbox flastadmin -TargetFolder foldername –whatif Disable-Mailbox flast@contoso.com –whatif Use the Exchange Management Console to re-create the Mailbox. Add Domain Admin account to the Mailbox using Exchange Management Console, Manage Full Access Permistions. Export-Mailbox -Identity flastadmin -IncludeFolders '\foldername' -TargetMailbox flast -TargetFolder inbox –whatif Now connect to the mailbox and move the mail and mail folders into the locations the user had them in. You did take notes or screen shots right??? Supreme Commander of the Asgard Fleet.

Ok I really dont know what caused the problem but i had to do an update the other day so it needed a restart and after the restart everything is back to normal and working. Thanks for all the suggestions guess it is just one of those things with microsoft.