Organizations (enterprise, small business, and education) with IT-managed Windows devices and updates. Note: If you are an individual who owns a personal Windows device, please go to the article Windows devices for home users, businesses, and schools with Microsoft-managed updates.

Customers must either configure SMB Server to require SMB Server signing or enable SMB Server EPA to harden their systems against this class of attack.

Before you can use Authenticator as a way to sign in, you need to download the app and have already added Authenticator to your accounts. Starting July 2025, the autofill feature in Authenticator will stop working, and from August 2025, passwords will no longer be accessible in Authenticator.

A digital signature is an electronic, encrypted, stamp of authentication on digital information such as email messages, macros, or electronic documents. A signature confirms that the information originated from the signer and has not been altered.

If you see an error message when you try to sign in to Microsoft Teams, the status code at the bottom left corner of the window can help your IT admin diagnose what went wrong with your sign-in process. In many cases, only your IT admin or sysadmin will be able to resolve sign-in issues for you.

Windows includes a security feature called kernel Code Integrity that helps protect your system by ensuring that kernel drivers loaded on your system run with integrity and are cryptographically signed by an authority trusted by Microsoft.

If you don't see the Sign Message button, you might not have a digital ID configured to digitally sign messages, and you need to do the following to install a digital signature.

You can create, edit, update, and manage official Brand kits, giving you the authority to maintain brand integrity while enabling all employees to easily generate on-brand materials.