Thanks, Brian.
I finally took the plunge and paid the obiligatory fee to Microsoft for a
one-time technical assist to troubleshoot this problem. The tech worked
remotely through my computer and immediately discovered that one of the
options for making Word my Email Editor was not clicked. (I am not sure how
that happened, as both "on" is the normal position for my computer.)
Afterwards, he couldn't get my Email signatures to function (except in plain
text), and he worked for nearly an hour before finding that the culprit was
apparently a SMS file that was in residence in my COM ADD-IN location
(Tools-->Options-->Other-->Advanced Options-->Com Add-in). He had a devil of
a time deleting the file. He eventually shut everything down and restarted
Outlook in the Safe mode. In this mode, he was able to finally extricate the
file and dispose of it. Afterwards, the signature features worked fine. He
indicated that he had never seen anything quite like my problem and thought
enough of the experience to refund my money.
BTW, the link you sent me would have solved the problem also during
reinstall of Office, when the add-in would have been overwritten.
I hope this helps some other user.
Uncle Ben