Until they shut down the server, which will almost certainly be soon after the certificate expires.

Yep. Scummy, even for Microsoft. Too bad their EULA blocks class action.

They were selling it until October 2021, so it's not some ancient system. By building a time bomb into it, they misrepresented what was effectively a $50/year subscription as if it were a $229 purchase. Should be a slam dunk case, but it won't be.