The era of using pirated Windows and Office software via free activation tools has come to an end. Following the release of the November 2025 Patch Tuesday update, Microsoft successfully patched a critical vulnerability, rendering the KMS38 activator defunct. This tool, developed by the Massgrave group (short for Microsoft Activation Scripts), was once the most popular and considered the safest method for users to activate Windows and Office without paying, even receiving full official security patches.
Immediately, users who activated their computers using this method began receiving notifications from Microsoft requesting the purchase of legitimate licenses. In this context, purchasing a Windows 11 key for only $10 USD or Office 2021 Pro for approximately $39 USD on the secondary market is currently the safest solution to avoid losing activation and data.
KMS38 “Killed Off”: The War Against Piracy Escalates
The KMS38 tool has existed and thrived for many years, circulating widely on tech forums, piracy sharing websites, and even on platforms owned by Microsoft such as Azure DevOps and GitHub. Its long-standing public presence attracted a large community of users. Although this tool is open-source, allowing the community to inspect it for malware, many still view Microsoft’s block as a necessary step to protect the ecosystem.
In their latest update announcement, the Massgrave group confirmed that the core KMS activation option has been locked down by Microsoft. These developers are now recommending that the community switch to alternative activation methods such as HWID (Hardware ID) or TSforge, which are still functioning. However, the group also expressed hope that they will soon find a way to bypass this new control from Redmond.
The move to close the KMS38 vulnerability comes just weeks after Microsoft implemented another tightening measure: blocking all known methods of installing Windows 11 without using an online Microsoft account. This includes removing the ability to install Windows 11 using a local account when there is no internet connection.
Microsoft Abandons Leniency Toward Pirated Software
In the past, Windows and Office piracy was always a challenge for Microsoft, but the company often maintained a relatively loose stance. There was a time when founder Bill Gates admitted that the widespread use of pirated versions helped propel Windows to become the dominant global desktop operating system. However, recent legal and technical actions indicate that Microsoft is undergoing a major strategic shift.
Redmond is shifting its focus toward subscription-based business models like Microsoft 365 and integrated AI services. Stricter control over software activation is a necessary step to secure revenue from these services and drive users toward legitimate licensing. The decision to permanently eliminate outdated activation methods demonstrates Microsoft’s determination to reshape its software market.
