Does any part of your LOB web app still require IE11?

For example, you might have clients with tons of legacy HTML/XML templates which are only rendered correctly in IE11 (with all its quirks)?

And so these clients insist they will continue using IE11 for your web app, because they rightfully want their documents to look 100% the same as they did 10yrs ago.

If this sounds familiar, how do you plan to eventually retire IE11 support?