Hello Roy Fisher,
Welcome to Microsoft Community.
I believe that you know that this software is no longer supported. I notice that Microsoft support has tried to provide you with some solutions, even reinstalling Windows, but your problem is still unresolved. I think this is because the software is no longer compatible with Windows 11.
We're probably running out of other solutions for you, and while this is frustrating news, it might be time to try some new software with similar features. I suggest you use the Mail app that comes with Windows, or trythe web version of Outlook email.
If anything is unclear, please do not hesitate to let me know.
Best regards,
Mitchell - | Microsoft community support expert from MSFT