I have been using Turbotax since 1990. It has been the only tax software I have ever used. At the ripe age of 76 I have no plans on buying a new computer just to run the new version of the program. I have a fully functional computer running Windows 10 which has the extended support from Microsoft.
A quick online search shows that the H&R program will import Turbotax forms. It's also cheaper. I start doing my taxes at the end of January. If the folks at Intuit don't realize the mistake they've made and allow us to use the program on Windows 10 machines I will become an H&R customer. At my age I won't be a customer of anyone for long, but I can tell you that you have pissed off a very loyal, and long-term, customer.
