Receive a warning instead If you need time to modify your workflow to unblock add-ins using one of the methods above, you can choose receive an additional warning for Excel XLL Add-ins that come from untrusted locations after choosing to enable them. Important This should only be done as a temporary measure to unblock Excel XLL Add-ins.

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 ...

Tip Don't send unsolicited promotional or commercial content. Don't send content to people you don't know or to many people at the same time. Don't use programs, scripts, or bots to create Microsoft accounts. Don't spoof or reuse information across multiple accounts when signing up. Don't create or use multiple accounts to violate Microsoft ...

If you receive the message “Your account is currently unavailable" when you try to access your OneDrive, your account might have been temporarily blocked due to unusually large traffic volume, suspicious activity, or a violation of the Microsoft Services Agreement or code of conduct.

Frequently asked questions (FAQs) about Smart App Control, a Windows feature designed to block malicious, untrusted, or potentially unwanted apps from running on your device. Tip For an overview of Smart App Control, see App & Browser Control in the Windows Security App. For an overview on App Control in Windows, see Application Control for Windows.

Windows 11 Windows 10 You are receiving this message because the Memory Integrity setting in Windows Security is preventing a driver from loading on your device. Here are a few options you can try if you want to be able to use this driver: See if an updated and compatible driver is available through Windows Update or from the driver manufacturer. If that doesn’t work, you can try turning off ...

Respond to unusual activity We may have blocked your sign-in if you're using a new device, if you installed a new app, or if you're traveling or in any new location. This security measure helps keep your account safe in case someone else gets your account information and tries to sign in as you.

How can I enable or disable web and search filters? Show me how download the Microsoft Family Safety app. Tell me about FILTER websites and searches Establishing internet boundaries is an important way to protect yourself and your family from inappropriate web content.

unblock Outlook emails from a specific sender Add email addresses and domain names that you trust to the Safe Senders List. On the Home tab, in the Delete group, click Junk, and then click Junk E-mail Options. On the Safe Senders tab, click Add. Type the email address or domain you want to add, and click OK.

The following list describes how Outlook behaves when you receive or send an unsafe file attachment: You cannot save, delete, open, print, or otherwise work with unsafe files. A message at the top of the e-mail message indicates that Outlook has blocked access to the unsafe attachment. The attachment is inaccessible from Outlook.