I have a user running Outlook 2007. This user has a very large mailbox and is in cache mode. He has alot and I mean alot of folders. He just started to notice the folders go missing. Then if he restarts Outlook a few times, the folders come back. I can connect to his mailbox from my Outlook 2007 client and the folders are there. Backups have the folders being listed and backed up. Any thoughts??