Windows 7 is due to reach End Of Life (EOL) on 14 January 2020, but a large number of the world's computers, most in corporate environments, are still running the nine-year-old system. Microsoft ended mainstream support for Windows 7 in January 2015, with extended support running till 14 January 2020.

Strange: There will be NINE KINDS of Windows 10 Or four, or six, depending on how you count

How to install the Windows 10 Technical Preview: Everything you need to know