No longer able to access my email using thunderbird since 1/10/2022. However when using outlook or webmail there are no problems. I am running Thunderbird version 91.5.0 ( 32 bit version) on a PC running Windows 10 version 21H1 built 19043.1415 using windows defender. I am using Aplus servers as the domain servers. In the last few weeks we had to re-enter the password during the day when using the email account as it would somehow loose it. Right now we can access the account through webmail on this computer and via outlook on another computer using the same password. When Thunderbird can not connect it comes back asking re-enter the password. Every once in while Thunrderbird will get through but very rarely.