I have two computers, both Lenovo. One is an older model running Ubuntu linux and the other is a newer one running Windows 11 and Ubuntu WSL. The plan is to move from the older to the newer. The older model has Thunderbird 140.10.1 esr (64Bit) and I have no problem with it. The newer one came with Windows 11 and Thunderbird 150.0.1 (64Bit) installed. I want to set up the newer computer with the same complement of email accounts as the older. This complement of accounts includes a gmail account, a yahoo account and an account that existed on comcast.net before being moved to yahoo. The latter still retains its comcast.net identity, but is served by yahoo. To support this account, it was necessary to provide Thunderbird 140 with the comcast.net email address, but configure it with yahoo entities underneath. However, this same process does not appear to be supported by Thunderbird 150. It seems to insist on using comcast.net entities, which do not exist anymore. My question is, am I correct in this conclusion, or is there a way, which I have not discovered, to configure the account to work on Thunderbird 150? If so, what might it be? One final note, I am not likely to be unique in the comcast.net issue. I suspect there may be thousands of us.