John wrote:

My guess is, therefore, that we are 'sharing' one mailbox on the server.

If you use the same username/password in the account to access the pop
server, then you are correct.

As mentioned I have set up two separate PST file systems, each with
Inbox, Calender, Contacts, etc - one for Me and one for Wife. I'm
happy to change that and do something different. There are two
windows llogins, although only one is ever used. In truth all I was
trying to do was to separate 'home' type emails from 'business' type
emails - using, hopefully 2 separate Inboxes. Does that help you
better to help me. I'd be grateful if you can.

I explained exactly how to separate your mail in my prior post. What did
you not understand? I'll be more precise if you need clarification, but
you'll have to point out what you don't understand.
--
Brian Tillman