Tony I think your a little confused. On-line backups are not done with
'M.S's MAPI', it's done through MS's api calls. MAPI is a interface used by
the older Microsoft Mail client. MAPI is the interface that the brick level
backup people use to extract the information from the Exchange Information
Store. PST files are personal folders that can be stored locally and hold
Outlook information such as email, calendar, etc. The recommended Microsoft
approach is to restore the entire Information Store to another server and
export the user's mailbox to a personal folder, ie:PST. Then import that
information into the production Exchange servers information store.

Mark