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2. System Locked Pre-installation - Wikipedia

   en.wikipedia.org/wiki/System_Locked_Pre-installation

   SLP installations require a master product key issued by each OEM maker, which is unique to the specific edition of Windows, such as Home (XP), Home Basic, Home Premium, Professional, Ultimate, etc. This SLP key is different from the product key printed on the Certificate of Authenticity affixed to an OEM assembled PC; COA product key is used ...

3. Microsoft Product Activation - Wikipedia

   en.wikipedia.org/wiki/Microsoft_Product_Activation

   In this case, the copy of Windows installed does not use the product key listed on the certificate of authenticity, but rather a master product key issued to OEMs called a System Locked Pre-installation (SLP) key. On each boot, Windows confirms the presence of specific information stored in the BIOS by the manufacturer, ensuring the activation ...

4. Windows 10 - Wikipedia

   en.wikipedia.org/wiki/Windows_10

   This build treated Windows 7 and Windows 8/8.1 product keys as Windows 10 product keys, meaning they could be entered during installation to activate the free license, without the need to upgrade first to "activate" the hardware with Microsoft's activation servers. [99]

5. Windows 7 editions - Wikipedia

   en.wikipedia.org/wiki/Windows_7_editions

   It was possible to use the Product Key from a Standard upgrade edition to accomplish an in-place upgrade (e.g. Home Premium to Ultimate). [31] [32] Starter to Home Premium; Starter to Professional 1; Starter to Ultimate 1; Home Premium to Professional; Home Premium to Ultimate; Professional to Ultimate 1; 1 Available in retail, and at the ...

6. Windows Anytime Upgrade - Wikipedia

   en.wikipedia.org/wiki/Windows_Anytime_Upgrade

   [2] [3] Windows Anytime Upgrade is included in Windows 7 to allow users to upgrade to Windows 7 editions. In Windows 8 and Windows 8.1 it was rebranded as Add Features to Windows and was used to purchase an upgrade license for the Pro edition or to add Windows Media Center to an existing Pro installation. Support for this feature was ...

7. Windows 7 - Wikipedia

   en.wikipedia.org/wiki/Windows_7

   Windows 7 is available in six different editions, of which the Home Premium, Professional, and Ultimate were available at retail in most countries, and as pre-loaded software on most new computers. Home Premium and Professional were aimed at home users and small businesses respectively, while Ultimate was aimed at enthusiasts.