Managing personal Outlook.com account settings, security, and privacy
Sorry to hear of your troubles - but am not surprised. Sounds like there are other things going on with the PC. A good local tech might be able to help (I repair pc's for a living). Regardless, MS should be supporting you. Have you tried to reach out to support for the the MS store? I am not sure how one would go about doing so but I do believe they have support just for the store - but I'm not certain of this.
At the very least you can request a refund for anything you purchased. If they won't grant it then take it up with your credit card company - assuming you used one to make the purchase.
Problem with MS is that they are a licensing company that publishes software for other manufacturers to us on their systems (with MS Surface products being the one and only exception to this - to my knowledge) . That puts the onus on the manufacturers for support - at least in theory. Nevertheless, once that warranty is over - it'd be nice if MS would step and do the right thing by offering support just for the O/S. But none of that is true in your case because you purchased an app from their store. Seems to me either the publisher of the app itself or MS should be willing and able to step in and lend some support. You're right - nowadays it's all about the money grab. Grab it and go - seems to be the new business model in America.
Apple, on the other hand, is the publisher of the O/S AND the manufacturer of the system onto which that O/S is installed. A one stop shopping experience, if you will. That makes all the difference. Even during the pandemic I had no problem reaching apple support. And never - NEVER - have I ever heard an Apple rep first determine whether or not the machine was still under warranty until they would/could talk to me. Yes, if it's a hardware issue and it is out of warranty then any repairs are at the cost of the consumer. But that's been a rare event in my experience. And regardless, there's always someone to TALK to that will usually guide you in the right direction, warranty issues notwithstanding.
Good luck to you my friend. Wish I could've been of more assistance.