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System Locked Pre-installation (SLP), also referred to as OEM Activation, is a product activation procedure for Microsoft Windows used by major OEMs of laptops and pre-built PCs wherein a Windows product key is added and locked to the machine's firmware before mass distribution. SLP product keys cannot be moved to other machines.
In Windows 8, Windows 8.1, Windows 10, Windows 11, Windows Server 2012, Windows Server 2012 R2, and Windows Server 2016, the 30-day grace period has been removed. If the operating system is not activated, there is a watermark showing the edition of Windows or a message telling the user to activate Windows on desktop.
September 1, 2021 10.0.19043.1237 [33] KB5005565 Release Preview Channel and public release: September 14, 2021 This update is no longer available from Microsoft Update Catalog or other release channels since September 12, 2023, although it continues to be available from Windows Update. 10.0.19043.1263 [34] KB5005611 Release Preview Channel:
Product activation is a license validation procedure required by some proprietary software programs. Product activation prevents unlimited free use of copied or replicated software. Unactivated software refuses to fully function until it determines whether it is authorized to fully function. Activation allows the software to stop blocking its use.
Windows 95 retail product keys take the form XXX-XXXXXXX. [2] To determine whether the key is valid, Windows 95 performs the following checks: The first 3 characters must not be equal to 333, 444, 555, 666, 777, 888 or 999. The last 7 characters must all be numbers from 0-8. The sum of the last 7 numbers must be divisible by 7 with no remainder.
[1] [2] It carries the build number 10.0.22000. [3] It was retroactively named "version 21H2" by Microsoft per its naming conventions that are labeled "YYHX", with YY representing the two-digit year and X representing the half-year of planned release (for example, version 21H2 refers to builds which initially released in the second half of 2021).
On September 20, 2023, around two years after the release date of Windows 11, Microsoft announced that users would no longer be able to use Windows 7 or Windows 8/8.1 keys to activate Windows 10/11. [73] However, as of 2024, there are some reports that they still work, under certain conditions. [74] [75]
However, for application compatibility reasons, Microsoft kept the major version number as 6 in releases following Vista, [52] but changed it later to 10 in Windows 10. [45] The build number is an internal identifier used by Microsoft's developers and beta testers. Starting with Windows 8.1, Microsoft changed the Version API Helper functions ...