i've had an inability on two home PCs that were on 8.1.1 to run Lync 2013/Skype for Business 2015. Since I often work from home, this was a pretty big deal. It would always crash immediately upon starting. I Googled the errors it logged & tried everything recommended (others had same issue), but nothing ever worked. I just couldn't use it.

so finally Boxcryptor released a Win10-compatible version (the only thing preventing me from upgrading), and when I upgraded those two boxes to Win10, Skype for Business 2015 magically started working on both! I figured MS was going to have to release a patch to fix the issue, or it simply would never work. How odd...