Here's what I have; Quickbooks Pro 2018

I can no longer send invoices through email using Google - Google says Quickbooks is no longer a secure service so that's gone.

Quickbooks backup ( not that I ever used it ) and support is flagged at the bottom of my Quickbooks window with a message stating both have been discontinued.

When starting Quickbooks now I get a message that takes up 1/4 of the screen telling me there is no longer support for IE11 as Windows is dropping it. They apparently do not support Edge with this version, there does not seem to be a way to switch browsers and Quickbooks is recommending ( of course) to upgrade and their proprietary "new" browser.

Their solution? Upgrade to the subscription service and all will be well.. Except I don't want their subscription and a perpetual license is not to be found anywhere for any newer version. 

So.. While I can run it, I have lost access to email for one and I'm waiting to see what the loss of IE11 is going to do.  

If it is still working for you great. I'm guessing you don't use gmail for your email service..

These companies do love their subscriptions. They've discovered a goldmine and they aren't going to give it up. I don't want to "rent" software by the month.