About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

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Microsoft is modernizing the activation experience for perpetual licenses. Beginning December 3, 2025, the traditional telephone-based product activation automation process has been moved from telephone to online. Customers will instead use the Product Activation Portal: Product Activation Portal The new digital workflow provides a more secure, reliable, and user‑friendly activation ...

See how to view the details for signatures and certificates.

Learn how to redeem a Microsoft/Xbox gift card or other code on your mobile device, Windows device, or Xbox console.

Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

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. Online: When you begin activation, Windows will try to use your internet connection to activate online. If you have ...

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

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Learn how to track shipping and pending orders from Microsoft Store. You can use account.microsoft.com to track orders from Microsoft Store.