3 daily use machines, plus work laptop from employer, are all Windows 7. There are some older machines that don't get used but still boot - one has XP, 2 have Win 98 SE, and one, an ORIGINAL Compaq Portable, has DOS 3.1.
On my main pc alone ( the one on my sig below), I have 3 OSes (Win 7, OSX Mavericks and Linux) installed on separate SSDs/HDD. One spare SSD is installed and waiting for Win 9 Preview to be released late this month.
My HTPC and 10 inch ASUS tablet are running Win 8.1.
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