Windows 7
Windows 7 Starter will be upgraded to Windows 10 Home
Windows 7 Home Basic will be upgraded to Windows 10 Home
Windows 7 Home Premium will be upgraded to Windows 10 Home
Windows 7 Professional will be upgraded to Windows 10 Pro
Windows 7 Ultimate will be upgraded to Windows 10 Pro
Windows 8
Windows 8.1 will be upgraded to Windows 10 Home
Windows 8.1 with Bing will be upgraded to Windows 10 Home
Windows 8.1 Pro will be upgraded to Windows 10 Pro
Windows Phone
Windows Phone 8.1 will be upgraded to Windows 10 Mobile. The availability of the upgrade may vary by hardware maker, mobile operator or carrier.
Excluded editions
Windows 7 Enterprise, Windows 8, Windows 8.1 Enterprise, and Windows RT/RT 8.1 are excluded from the free upgrade offer.