For a roving user's mail to be accessible from each computer, the user must use only the server-based information store. If the user moves mail to a local .pst file (personal folders in Microsoft Exchange Client), it is not available from other computers.
You can prevent users from creating personal folders by installing Microsoft Exchange Client without the personal folders service. Without this service, users cannot add personal folders to their profile.
To install Microsoft Exchange Client without personal folders
Note This works only if Microsoft Exchange Client has never been installed on the computer.
If Microsoft Exchange Client was previously installed on the computer with personal folders, personal folders are available even if you remove the client by selecting Remove All in Setup or if you reinstall with different services. The only way to remove the service is to edit the Mapisvf.inf file manually.
To remove personal folders from a Microsoft Exchange Client that has already been installed
MSPST MS=Personal Folders