Outlook won't load - I get this error

Question

Outlook won't load - I get this error

Elli Goss 40

UTC Date: 2026-08-31T23:41:33.429Z
Client Id: 91943932FAA74BBB8135D54B2B60ACB8
Session Id: cfb91085-1449-456f-b96d-cf508ecd1134
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: LO4P302CA0025
reqid: b4fee747-3462-430d-491e-704658a244e1
cv: A5xPsl4hvv7flyXrPtgDpN.3.1.1

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Answer 1

Hornblower409 14,690

@Elli Goss said

err: Error: 500

There is an on-going Outlook outage. There is nothing you can do from your side to fix it.

See the Answer by "EmilyS726 Aug 31 2026" in
https://learn.microsoft.com/en-us/answers/questions/5990257/microsoft-outlook-outage

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Answer 2

Hi @Elli Goss ,

This is a server-side issue (500 error on StartupData load), not something wrong with your device. A few things to try:

Hard refresh the page (Ctrl+Shift+R) or clear browser cache/cookies for outlook.office.com.
Try a private/InPrivate window to rule out extensions or cached data.
Try a different browser, or the desktop/mobile Outlook app, to see if the issue is limited to OWA.
Check Service Health in the Microsoft 365 admin center (Health > Service health) for any ongoing Exchange Online incidents.

If none of that works, this needs to go to your tenant admin or Microsoft support with the error details, since it's a 500 from their backend (efe: LO4P302CA0025). The reqid and cv values in your error are what support will need to trace it on their end.