*Must be running the latest version of Windows 7 (Service Pack 1) to receive the free upgrade to Windows 10 via Windows Update.
**Must be running the latest version of Windows 8 (Windows 8.1 Update) to receive the free upgrade to Windows 10 via Windows Update.
*** Also applies to Windows 8.1 country specific editions, Windows 8.1 Single Language, Windows 8.1 with Bing.
****The availability of Windows 10 upgrade for Windows Phone 8.1 devices may vary by OEM, mobile operator or carrier.
“N” and “KN” editions follow the upgrade path of the parent edition (e.g., Windows 7 Professional N upgrades to Windows 10 Pro).
Some editions are excluded: Windows 7 Enterprise, Windows 8/8.1 Enterprise, and Windows RT/RT 8.1. Active Software Assurance customers in volume licensing have the benefit to upgrade to Windows 10 enterprise offerings outside of this offer.