Summary Starting with Windows security updates released on and after October 14, 2025, File Explorer automatically disables the preview feature for files downloaded from the internet. This change is designed to enhance security by preventing a vulnerability that could leak NTLM hashes when users preview potentially unsafe files. For more details, review the following frequently asked questions ...

Contact your organization’s IT department for additional information about which label to apply and when. Sensitivity labels are published to users rather than locations such as sites or mailboxes, so you and a coworker might see different sensitivity labels available to apply.

Check the Xbox services, games, and apps for any service outages.

Xbox Support ... Xbox Support

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 ...

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

This article contains information about the restrictions and limitations that apply to files, file names and file types when syncing with OneDrive for home, OneDrive for work or school or SharePoint in Microsoft 365.

For technical support, go to Contact Microsoft Support, enter your problem and select Get Help. If you still need help, select Contact Support to be routed to the best support option.

To contact us in Outlook.com, you'll need to sign in. If you can't sign in, click here. For other help with your Microsoft account and subscriptions, visit Account & Billing Help. To get help and troubleshoot other Microsoft products and services, enter your problem here.

A file in SharePoint, OneDrive, or Teams is blocked. What do you do? Read this article to learn why this is happening and steps you can take.