Since M$ is doing away with simple free apps (such as Mail) and forcing users to move to cloud-based expensive apps, you can use FOSS (Free and Open Source) alternatives -- especially the Portable ones (e.g., apps from PortableApps.com) that don't need an install, they can run off a USB drive, and app+userdata can be easily backed up without fuss.
https://alternativeto.net/software/mail-calendar-people-and-...
Couldn't find a decent minimalist calendar program that integrated well with Windows. People say they like OneCalendar but I refuse to use the Windows Store, I even got WSL set up without it lol
https://vivaldi.com/blog/vivaldi-mail-calendar-feed-reader-a...
But you can also just use it as an email client and ignore the browser part.
Either way, MailSpring works fine for email, and I've recently discovered Fantastical for a straightforward calendar program.
But it's absurd that I have to do this at all. At a minimum, if I buy a laptop, Microsoft should not be able to actively break it without refunding me 100% of the purchase price.