After a February 2021 Win 10 upgrade I am able to receive Windows Live emails in all 4 of my email addresses. "An error occurred in opinion this file."

I have been receiving and sending email in Window Live Mail with Windows 10 for some months. But after a recent February 2021 Win 10 upgrade I can not reply or send.

I have been using Win 10 just fine through 2020 and it is only a recent update in February 2021 that caused the problem.  I can receive email but not send or forward: "an error has prevented this file from opening". This happened only after Win 10 MS TECH support "fixed" a prior problem. Most suggested solutions are responses to older questions not exactly the same.