For my work computer I keep a Outlook Data File (.pst), as a place to backup email. I keep the pst-file on my network share, which ensure that it's backed up. Recently I've experienced trouble with this solution when I've disconnected from the network while Outlook is running. I end up with a corrupt Offline Files Database which fail when syncing the pst-file. I can access the file while I'm not connected to a network, but as soon as I connect the file size appear to be 0 kB.
You can do this by setting a flag in the registry.
- Open regedit
- Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\CSC\Parameters
- Create a new REG_DWORD named FormatDatabase with a value of 1
- Restart computer
- Add folders to the Offline Files Database
It's important to remember to re-add the folders to make them available offline again after the restart.
To reapply group policies use the command (from this page):