I have one user that has an incorrect unread message count in their OWA view/access. This is also causing their iPhone to get the same incorrect unread message count. It started a few days ago when I had to run a repair on their local .ost file.
Restore full virtual machine or individual guest files from 19 common file systems directly from the backup file. Schedule VM backups with PowerShell scripts. Set desired time, lean back and let the script to notify you via email upon completion.