Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow. There are two methods to which you can activate your product: Online via the internet, and by using the Product Activation Portal.

Accessible help and resources to get your Xbox questions answered. If you see error 0x803f8001, check the Xbox service status. Find more solutions here.

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

Learn how to use the Activation troubleshooter to resolve common activation issues in Windows.

Sometimes when you run the Activation troubleshooter or try to activate, the error code and message will change. If the error code has changed, look up the new code below and follow the recommended steps.

Learn how to activate Office that is pre-installed on new Windows 10 PCs or using a new product key.

If you're troubleshooting Office and would like to remove the license files on your Mac, you can use the license removal tool. This will completely remove all licenses for Microsoft 365 for Mac.

다른 컴퓨터 (본인 소유 또는 다른 사람 소유)나 하드웨어 변경 후 동일한 컴퓨터에 이러한 버전의 Office를 설치 및 정품 인증하려고 하면 최대 활성화 수에 도달했다는 오류 메시지가 표시될 수 있습니다. 참고: Office 일회 구입 제품이 여러 개 있어 후속 Office 설치를 정품 인증하는 데 문제가 발생할 경우 Office 제품 키 변경 을 참조하세요. 소프트웨어 사용 조건의 이전 약관에 따라 진행할 경우 Office를 다른 컴퓨터로 가져갈 수 있지만 전화로 정품 인증한 다음 원래 컴퓨터에서 Office를 제거해야 합니다.

If Office activation fails, you'll see Unlicensed Product or Non-commercial use / Unlicensed Product in the title bar of your Office apps, and most features of Office are disabled. To restore all features of Office, you'll need to fix the problem that's causing activation to fail.

If you see this message, this means that your Microsoft 365 or Office product key has been blocked and will no longer work. If your Office product key doesn't work, or has stopped working, you should contact the seller and request a refund.