BT wants me to uninstall all browsers because of Yahoo hacking issues. How do I uninstall Microsoft Edge without problems? I have Microsoft/Office 2010
Microsoft's official answer is that you cannot uninstall Edge. You can, of course, and here's a set of instructions, but it's hecka complicated and somewhat risky. So, I doubt that British Telecom actually intends you to get that far into the guts of Windows 10 just because of something having to do with Yahoo.
P.s. I wonder if BT actually sent the message. Sounds like it might be a phishing attempt.