Even though I thought I had already overdone writing about Windows 10, questions keep rolling in! Six months after introduction, Windows 10 has been installed on over 213 million computers; this is an adoption rate even greater than Windows 7, the previous record holder.
Upgrading to Windows 10 is currently free to those who have Windows 7 or Windows 8.1 already installed on a personal computer. The offer does not extend to those who have Windows XP or Vista, nor can businesses participate in this promotion. The promotion officially ends on July 29, 2016, but there are rumors that the offer will be extended.