Outlook.live.com issue; opening e-mail now opens "About Blank" page

Hi!

Please perform these tests and send me the results:

1. Test in another browser. Access https://outlook.live.com/mail/ in both Microsoft Edge and Mozilla Firefox, which uses a different engine than Edge.
2. Test in the new Outlook app for Windows:

https://apps.microsoft.com/detail/9nrx63209r7b?hl=en-US&gl=US

3. Test on another device to verify if your device has been blocked. Test on another computer and also on your mobile phone (browser and Outlook Mobile app).

iOS: https://apps.apple.com/us/app/microsoft-outlook/id951937596

Android: https://play.google.com/store/apps/details?id=com.microsoft.office.outlook&hl=en_us

4. Test on a different internet connection. Connect your computer to a different Wi-Fi network, or if you have a wired connection, disconnect the cable > Connect your mobile phone to the computer with a USB cable > Turn off Wi-Fi and turn on mobile data > Look for the USB Tethering option in your phone's Settings to share your phone's internet connection with your computer.

I look forward to your feedback!

This behavior is commonly caused by browser add-ons or ad/pop-up blockers interfering with Outlook.com.

Try these steps in order:

1. Test in another browser
   • Open Outlook.com in Microsoft Edge or a different browser.
   • If emails open normally there, the issue is specific to the original browser.
2. Disable ad-blockers for Outlook.com
   • If using AdBlock in Chrome: at the top-right, select AdBlock > Don't run on pages on this domain while on outlook.live.com, then refresh the page.
   • For other ad-blockers (like uBlock), temporarily disable them or add an exception for Outlook.com, then reload and test opening an email.
3. Remove or disable problematic extensions
   • In the affected browser, open the extensions/add-ons manager.
   • Disable ad-blockers and other extensions one by one, testing Outlook.com after each change.
   • If Outlook.com works after disabling an extension, remove that extension.
4. If using Firefox
   • Certain add-ons in Firefox can prevent Outlook.com content from loading. Follow Firefox guidance to disable or remove add-ons, then test Outlook.com again.

If emails load correctly after these steps, keep Outlook.com excluded from ad-blockers and avoid reinstalling the problematic extension.

References:

• Fixes or workarounds for recent issues on Outlook.com
• Outlook.com "Something Went Wrong" - Microsoft Q&A
• Can't log into Hotmail on Firefox anymore - Microsoft Q&A