By Diane Poremsky |slipstick.com
Moving the offline cache so its easier to back it up is generally pointless: it’s an offline copy of your Exchange mailbox and it can only be opened by the account that created it. If you try to use an old cache file, Outlook will complain that it doesn’t match the server mailbox. If the server fails and there is no server backup, the contents of the current, most up-to-date *.ost should be used to repopulate the server. In short, if you want a usable backup of your mailbox, export the contents to a *.pst file instead of including the *.ost in a backup file.
If you need to recover data from an orphaned ost file, I have a list of commercial recovery software listed at Convert an Offline File (.ost) to a Personal File (.pst)
With that disclaimer out of the way, if you do need to relocate the offline file, you can move it using the following steps.
If you are moving an .ost file, you need to create the ForceOSTPath registry value before adding the account to your profile. Continue reading