When you connected to that Exchange mailbox via the secondary PC, did you
connect via the Exchange transport or POP3? The reason that I ask is that
when the Inbox ends up empty, either the user POP'd the mail off the server
and it is sitting in a PST on said computer or they connected via the
Exchange transport but had a PST file set as the default delivery location.
This will cause all the items to move from Inbox on Exchanger server to
Inbox in PST file.
In either of the two cases above, it is just a matter of configuring a
profile that connects to the Exchange mailbox via the Exchange transport
(Exchange mailbox set as default delivery location) and then opening the PST
file that contains the items. Just copy/move all the items from the PST
file back to the Exchange mailbox.
