See how to view the details for signatures and certificates.

Learn what to do if you see error 0x87dd0013 when you try to start a game or an app on your Xbox One or PC.

If you are prompted to select an app, select Open with > Information Protection Viewer. If you see a page to Sign in or Sign up, click Sign in and enter your credentials.

Learn about the risks of allowing apps through Windows Firewall, and how to add or remove apps from the list of allowed apps.

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

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

If you see “UPnP Not Successful” in your Xbox console’s network settings, your router may need an update.

Add a recipient's digital ID to your Contacts in classic Outlook To send and receive encrypted email messages, both the sender and the receiver must share their digital ID certificates with each other. Open a message that is digitally signed as indicated in the message list by a Signature icon.

Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages. Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public ...

Do you own this game or app? If you have a game disc, insert it now. Otherwise, make sure you're signed in to the Xbox network. If you don't have rights for playing it, you'll need to get it at the Microsoft Store. This may mean that we’re having trouble checking usage rights, or that the game is no longer in the Game Pass catalog.