Registering a device gives your phone access to your organization's services but doesn't allow your organization access to your phone. If you're an administrator, you can find more information in Configure and enable users for SMS-based authentication. If your organization hasn't made SMS sign-in available, you won't see an option for it when registering a phone with your account. When you ...

在Outlook 中，可以为电子邮件创建一个或多个个性化签名。 签名可以包括文本、链接、图片和图像 (，例如手写签名或徽标) 。

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

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 ...

Learn how to sign in and create app passwords for Microsoft apps and devices that don't support two-step verification.

The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

When you try to create a new signature linked to your own account (cloud signatures), you notice that the newly created signature gets deleted after a while or you may find that the signature does not sync up with Outlook Web App (OWA).

Learn how to add all your different accounts to the Microsoft Authenticator app.

If your organization is using multi-factor authentication (MFA) for Microsoft 365, the easiest verification method to use is the Microsoft Authenticator smart phone app.

After your download the new email app, add your accounts and they will all be configured to use Modern Authentication and sync properly, helping keep them safe.