Since you upgraded your email system I cannot use email in IE or Edge browsers. It says I need to update my browser. Both are fully updated. I also reported this to your chat support, they confirmed I am up to date, and said they would fix on your side but never heard back. My systems is up to date. Your mail app still has problems.
I just tried with both Edge and IE-11 and it works just fine for me. Did you try clearing history in either one then re-start it?