How to fix UTC Date: 2025-12-10T19:44:05.783Z Client Id: 40F4686CEA9D4F1CA759229F835C9093 Session Id: c8c4e5a4-8884-401c-b7ae-ea4d3008c200 Client Version: 20251128003.09 BootResult: fail Back Filled Errors: None err: Error: 440 esrc: StartupData et: Serve

Hi Matt,

Thanks for reaching out. I understand how frustrating it can be when Outlook or Hotmail suddenly stops working, especially if you rely on it daily. The error you’re seeing (Error 440) usually points to a startup or authentication issue, and there are a few steps we can try to get you back up and running.

First, make sure your system clock and time zone are correct. Outlook services depend on accurate time settings for secure connections. Go to Settings → Time & Language and enable “Set time automatically,” then restart your device.

Second, clear your browser cache and cookies, and try opening Outlook in an InPrivate window. This helps rule out any corrupted data or extensions interfering with the login process.

Third, if the issue persists, test on a different browser or device, or even a different network like a mobile hotspot. This will help confirm if the problem is local or account related.

Last, sign out of all Microsoft sessions from account.microsoft.com, then sign back in and complete any MFA prompts. If you’re using the New Outlook desktop app, you can also reset the local profile by running olk.exe --clearLocalState from the Run dialog.

I hope you find this information helpful. Please let me know if you have any further questions If the answer is helpful, please click "Accept Answer".

Regards,

Carlo