Hi guys! I'm using THUNDERBIRD for many decades with great success BUT once in awhile, a crazy Program (like this time the Microsoft's 'SKYPE') screws my Email RECEIVING/SENDING function of THUNDERBIRD. Here are some details re my issues: - I've just completed installation of SKYPE Software Update (Microsoft), and shortly after that the RECEIVING/SENDING function stopped working (!!!) while the SERVER has started asking repeatedly for re-entering my Password: I've done it several times trying most recent & updated Passwords BUT they have been refused all to accept them by the SERVER and considered as 'invalid Passwords' - and I'm at the END of OPTIONS now... I'm running WIN-10, and using MOZILLA-recommended POP3 as POP Mail Server, and '''Normal password''' as well as ''QAuth2'' 'Authentication' settings - and SMTP OUTGOING SERVER as 'smtp.mail.yahoo.com' and also tried 'smtp.mail.frontier.com' setting however ---> NOTHING WORKED! - also try to use the ''Back-up copy of Bookmarks'' (dated approx 2 weeks BEFORE this problem has developed: by the way DOES ANYONE KNOWS if the ''Back-up copy of Bookmarks'' also SAVES the Passwords & other ''critical'' Thunderbird's settings ...?!? Any earlier help to resolve this issue from anyone would be GREATLY APPRECIATED! NOTE: Please keep in mind to leave any advice & suggestions ''at this Forum'' because my RECEIVING/SENDING function is NOT working ...