All my machines can run Windows XP, so it's my primary OS. My tablets can only run Windows 10. These don't count as real computers...
Windows XP
Windows 7
Windows 8.1
Windows 10
Other (non-Microsoft) OS
All my machines can run Windows XP, so it's my primary OS. My tablets can only run Windows 10. These don't count as real computers...
my home : Windows 10 and Chrome OS
office : Windows 8
I am comfortable with Windows 7.