Thus, my original instinct to put that PST file on the server, where any system on my net could get at it, was a good one. Note that Outlook locks that PST file when any instance of Outlook accesses it, and no other program is allowed to get at it. That includes backup, which I'll get to in a few minutes. The important point is that any machine can now run Outlook and put its results in the same PST file, but of course only one can be doing that at any given time. I moved the Outlook.
Some rules play an announcement sound.
Others send stuff from known spam sources to the junk heap. It seemed simple enough. Go to each rule and specify the folder. It went pretty fast. The first dozen rules were important people and I knew precisely where I wanted their messages sent.