Hello to everyone!
I use an email clone of Mozilla Thunderbird named Betterbird.
To make a long story short:
1. over time my PC became unstable losing Updates capability.
2. My Email Provider, Outlook.com changed itself (See pics).
See here for all Mozilla-related info:
https://www.sysnative.com/forums/search/469613/?c[users]=DonB&o=date
Thanks, Don