BootResult: fail Back Filled Errors Hotmail access error on all devices

Question

I am receiving this error when trying to access hotmail account. I have tried clearing cookies, history, rebooting, changing my password, and logging in in a private browser, safari, & chrome.

UTC Date: 2026-09-01100:10:13.427Z

Client Id:

Session Id:

Client Version:

BootResult: fail

Back Filled Errors: Unhandled Rejection: SyntaxError: The string did not match the expected pattern.:undefined| undefined: undefined| undefined:

err: Error: 500 esrc: StartupData et: ServerError

estack: w@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.491fdc82.js:1:811

@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.491fdc82.js:1:192544

st: 500

efe:

regid:

Answer 1

Hi Renee,

This does not look like an issue with your browser or password. Microsoft is currently dealing with an Exchange Online/Microsoft 365 service incident that includes authentication and connectivity failures, which fits the BootResult: fail and server error 500 you are seeing.

Since you have already tried different browsers, devices, clearing cookies and changing the password, I would not make any further account changes for now. Microsoft is actively working on the issue and has reported recovery in parts of the service, so please try Outlook again later.

Thank you, and feel free to respond back for more assistance.