I have been running the Windows 10 Insider Preview on my Dell XPS 12 convertible for the past five months so I am familiar with the new operating system. Today my primary system, a Dell XPS 8700 desktop, was upgraded from Windows 7 Professional to Windows 10 Pro and I have never experienced a smoother upgrade. My desktop in Windows 10 is almost identical to my Windows 7 desktop and all my software seems to be working. The only thing I haven’t been able to do is use my favorite bookmark program, Bookmark Buddy, with the new Microsoft Edge browser. That may require an update to the bookmarking software. I read a review that said Windows 10 is the best of Windows 7 and 8 and I agree with that review.