timmmay:sbiddle: But there isn't just one set of programs. If you click on calculator from the modern UI home page you're going to get the modern UI touchscreen version. If you launch it from the desktop you'll get the old classic UI.
The problem is Windows8 just made the whole mix between both far too confusing. 8.1 and the 8.1 update improved on this greatly, but it's really taken Win 10 to fix the issues.
Interesting, but that's not my experience. I don't even see the modern UI, I just see a standard desktop and start menu, like Windows 7. I just hit start, type calc, hit enter, and I get the slow modern app instead of the fast old app.
I meant the old calculator in 8.1, not 10.