My Outlook.com mailbox is inaccessible across all clients.

Question

Arslan Ilyas 20

Symptoms:

Error:

BootResult: fail

esrc: StartupData

et: ServerError

st: 401

ehk: X-OWA-Error

This occurs on multiple devices and networks.
Please check mailbox provisioning/startup data errors on the backend.

How can I fix this. Please advise.

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Answer 1

EmilyS726 267.9K Independent Advisor

Hello. This error is server side related. It’s usually temporary and should resolve itself eventually. I’m seeing other users reporting this now too.

Arslan Ilyas 20 Reputation points

2026-07-09T18:37:03.89+00:00

Thanks for your response. Its been almost 12 hrs however still not resolved.
EmilyS726 267.9K Reputation points Independent Advisor

2026-07-09T18:58:24.57+00:00

Unfortunately I won't be able to tell you how long it can take. From what I've seen here, it can last 24-48 hours. See another case from recently https://learn.microsoft.com/en-us/answers/questions/5932536/401-error-when-trying-to-login-to-outlook-com-or-o
Arslan Ilyas 20 Reputation points

2026-07-09T19:04:46.0633333+00:00

Thanks a lot. I'm getting exactly same error. So I hope it will be resolved automatically, Thanks once again.
EmilyS726 267.9K Reputation points Independent Advisor

2026-07-09T19:07:25.2066667+00:00

You are welcome.
Arslan Ilyas 20 Reputation points

2026-07-10T10:54:15.38+00:00

Thanks a lot for your time and support. The issue resolved automatically.
EmilyS726 267.9K Reputation points Independent Advisor

2026-07-10T10:54:56.3766667+00:00

You are welcome Arslan. Glad to hear.