Outlook.com/Hotmail mailbox won't load on any device - Error 500, BootResult: fail, StartupData

Question

Outlook.com/Hotmail mailbox won't load on any device - Error 500, BootResult: fail, StartupData

Courtney 0

My Hotmail account was working normally earlier today, but beginning around 1:30 PM Pacific Time I became unable to access my mailbox.

Important details:

I can successfully sign in to my Microsoft account.
My Hotmail alias is still listed on the account.
Another Hotmail account works normally on the same devices and network.
The problem occurs on all devices tested:
Mac browser
iPhone Mail
Outlook.com web access

I have tried:

Different browsers
Private/Incognito mode
Clearing cache and cookies
Different devices
Different Outlook web addresses

The result is always the same error:

UTC Date: 2026-08-31T22:08:59.837Z

Client Id: 71CA8B87A09D433C92FAD2F7B8156EB6

Session Id: d3a0d849-545b-410a-9b89-dfc23c90e6d8

BootResult: fail

esrc: StartupData

et: ServerError

st: 500

efe: BY3PR04CA0006

reqid: f66ac770-4582-9347-652a-d4f8080c780d

cv: ACDGUxsprm1vz4fGnH3/9h.3.1.1

Additional information:

Test emails sent to this hotmail account do NOT bounce back.
This suggests the mailbox still exists and is accepting mail.
The issue appears specific to this mailbox because another Hotmail account works normally.

Could a moderator or Microsoft engineer please check whether there is a mailbox provisioning or mailbox initialization issue associated with this account and advise on next steps?

Thank you.

Charles Webster 0

I experienced the exact same thing today. No clue. My neighbor's Hotmail account still works for him.

UTC Date: 2026-09-01T00:19:14.151Z
Client Id: 5B0C3A6CDC1C4671A90881F8FCCC86F7
Session Id: 6efd6d4d-8295-471f-bd14-dbeb89e56420
Client Version: 20260821009.09
BootResult: fail
Back Filled Errors: None
err: Error: 500
esrc: StartupData
et: ServerError
estack: Error: 500
    at Object.w [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.491fdc82.js:1:806)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.491fdc82.js:1:192520
st: 500
efe: SA1P222CA0036
reqid: 10abd28c-c704-f229-6d55-b22b08b7a341
cv: dACE7HXhiLZj3S02wlrL1n.3.1.1

1 answer

Your answer

Charles Webster 0 Reputation points

2026-09-01T00:25:48.8666667+00:00

I experienced the exact same thing today. No clue. My neighbor's Hotmail account still works for him.

UTC Date: 2026-09-01T00:19:14.151Z Client Id: 5B0C3A6CDC1C4671A90881F8FCCC86F7 Session Id: 6efd6d4d-8295-471f-bd14-dbeb89e56420 Client Version: 20260821009.09 BootResult: fail Back Filled Errors: None err: Error: 500 esrc: StartupData et: ServerError estack: Error: 500 at Object.w [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.491fdc82.js:1:806) at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.491fdc82.js:1:192520 st: 500 efe: SA1P222CA0036 reqid: 10abd28c-c704-f229-6d55-b22b08b7a341 cv: dACE7HXhiLZj3S02wlrL1n.3.1.1

Answer 1

Hornblower409 16,450

@Courtney @Charles Webster

If you try to access your account using Outlook Web at https://outlook.cloud.microsoft/ , do you get an error message that contains the line err: Error: 500 ? If so, this is part of an on-going Outlook service outage. See the Answer by "EmilyS726 Aug 31 2026" in https://learn.microsoft.com/en-us/answers/questions/5990257/microsoft-outlook-outage

If not, please advise in a comment to this Answer what (if any) error messages you see, and additional details on what is not working.

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