KMS Activator is a software tool used to activate Microsoft products, including Windows and Office, by simulating a Key Management Service (KMS) server. Facilitates activation of Windows and Office by mimicking KMS servers. Offline activation method. Temporary activation: Typically requires reactivation every 180 days. Using KMS activator may breach Microsoft’s license agreements. Not recommended for long-term or commercial use, as it may lead to software instability or security risks. Works with multiple versions of Microsoft Windows and Office.