Форум поддержки Thunderbird

Sorry for posting this here but no response in TB forum. After I installed the latest up grade TB 115 I have lost all the old emails in my inbox, sent, and trash as well as the ability to use TB as I can't sign in. I get the following prompt when trying to use my account. "Sending of password for user ****@att.net did not succeed. Mail server inbound.att.net responded: [SYS/TEMP] Server error - Please try again later", and then a prompt to "Enter your password" which does not work, although the pass word shows up in"passwords". The TB account works fine in the Yahoo web account, but I don't keep anything there on a daily basis. The web TB account lets me send and receive mail normally. I haven't changed my configuration ,password or uninstalled TB. My G mail works normally. My android cell also won't let me sign in and asks for credentials per password which is unrecognized.

I have recently run into this issue in Thunderbird Supernova. Some of the menus are flyout menus, but others are note. In Firefox one set of menus which would be so much quicker to use as flyout instead of having to click and then not be able to go back, are the menus accessed from the 3 parallel lines in the upper right of the screen.

What is the reason why FFox does not use a standard flyout menu like you find in all the windows menus that is so much easier and quicker to use? And is there a reason such a menu structure cannot be implemented for the item mentioned above?

Thanx.