"Unable to log in at server. Probably wrong configuration, username or password." for all accounts.

I've made some progress. The server for Hotmail is smtp.live. com. That got Hotmail straightened out. I'm not sure what I did for the Gmail accounts. I went to Giggle and set "Less secure app" and also went through the Advanced Config during Create (I didn't change anything, tho). I have the accounts now but, each time I launch Thunderbird I get a Giggle sign-in for each folder that I visit ??? Any ideas on that one ?

I saw the solution here: https://support.mozilla.org/en-US/questions/1271683

What is the authentication type on your gmail account, normal password or OAuth2? If it's the former, try the latter, and complete the authentication next time you connect to the account, when an authorization browser window should appear.

Thank you @sfhowes