KMS activators are commonly used in unofficial or unauthorized activations, and while it can offer activation without internet connectivity, it is often considered illegal and potentially harmful. Uses KMS (Key Management Service) to activate Microsoft products. Offline activation method. Temporary activation: Typically requires reactivation every 180 days. Using KMS activator may breach Microsoft’s license agreements. Long-term use may cause technical issues or security vulnerabilities. Works with multiple versions of Microsoft Windows and Office.