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

Signing your email messages with a digital ID helps to prove your identity and prevent message tampering.

This article explains how to repair apps and programs in Windows 10 and use Settings to fix common app issues without reinstalling. Select Start > Settings > Apps > Apps & features. Apps & features in Settings Select the app you want to fix. Select Advanced options under the name of the app (some apps don't have this option). In the page that opens, select Repair if it's available. If it isn't ...

Find everything you need to manage your Microsoft account, Xbox profile, and more.

Learn how to fix error 0x80072EE2 so you can install an Xbox Game Pass game on a Windows 10 device or install the latest update to your 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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.

If you see error code 0x87E00011 when you try to download content to your Xbox console, try the solution below.

To learn about digital signatures (also known as digital ID), what they can be used for, and how to use them in Word, Excel, and PowerPoint, see All about digital signatures. Create a signature line in Word or Excel (desktop) In the document or worksheet, place your pointer where you want to create a signature line. On the Insert tab, select Add a Signature Line in the Text group. In the ...

See how to view the details for signatures and certificates.