@InterLinked1 What I wrote above and you have quoted specifically applies only to Exchange Online in M365, a service run/managed by Microsoft. If you have your own Exchange server (on-premises) then it does not apply to you, you should be able to use Outlook 2010 on Windows 7 to connect to a mailbox on your on-premises Exchange server. Hope this clarifies.
I'm not using Exchange on prem. It's a personal @outlook.com account.
Granted, I haven't tried adding a new account since this happened. But existing accounts do seem to continue to work. I'm using an "unsupported" Outlook and "unsupported" Windows and yet it works. So don't be fooled by the official Microsoft line into giving up the software you want to use. If you believe in software choice, by all means continue using Outlook 2010/Windows 7, because you can and it (at least in some cases) still works with Exchange.
Hopefully by the time it inevitably hits the fan, I can spin up my own on prem Exchange 2010 server, but I'm trying to delay that as long as possible. It's just sad that Microsoft is emulating Apple now and, like them, force obsolescing anything it can't sell to people anymore.