When I try to open my email account through outlook I get this error message on any device

Neil Downing 0 Reputation points
2026-05-30T23:39:47.12+00:00 
UTC Date: 2026-05-30T23:27:20.850Z
Client Id: E915D91B4EA543508E6AE99E81B6E659
Session Id: 5cdfa492-0652-4d94-ba96-7b0427d74740
Client Version: 20260522011.06
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/msalv5/scripts/owa.mailindex.a5b0bfec.js:1:806)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/msalv5/scripts/owa.mailindex.a5b0bfec.js:1:185451
st: 500
efe: BN9PR03CA0502
reqid: 826476aa-3977-69ce-d864-8603760e4c6b
cv: tW0AsmaAK7P0d27BVlnwjK.3.1.1
Outlook | Web | Outlook.com | Email
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  1. AI answer

    2026-05-30T23:39:57.11+00:00

    The error details show HTTP 500 with esrc: StartupData, which matches known Outlook on the web/Outlook.com startup failures where the mailbox object is not accessible even though sign-in succeeds.

    Based on similar cases, the most likely cause is that the mailbox has been disabled or treated as terminated in Exchange Online while the account in Entra ID (Azure AD) is still active. In this state, sign-in works, but Outlook and Outlook on the web cannot load the mailbox and return 500/StartupData errors.

    Required actions:

    1. Contact the Microsoft 365/tenant administrator
      • Ask the admin to check the mailbox status in Exchange Online for the affected account.
      • They should verify whether the mailbox is disabled or marked as terminated.
      • If AccountDisabled (or equivalent mailbox flags) indicate the mailbox is disabled, this aligns with the behavior described.
    2. Re-enable the mailbox
      • The admin needs to re-enable or restore the mailbox in Exchange Online for the user account.
      • After re-enabling, retry Outlook on the web (Outlook.com) and Outlook clients.
    3. Optional admin check
      • The admin can also review whether other mailboxes in the tenant are disabled in a similar way and correct them if needed.
    4. While waiting for admin fixes, basic client-side checks
      • Sign out of all Microsoft sessions in the browser.
      • Clear browser cache (for example, Ctrl+Shift+Delete → clear cached data).
      • Try Outlook.com in an InPrivate/Incognito window.
      • If it works only in InPrivate, disable browser extensions such as ad blockers or VPNs and test again.

    If the mailbox is confirmed as enabled and healthy but the error persists, the tenant admin should open a support case with Microsoft 365 support so Exchange Online support can investigate the 500/StartupData failure on the service side.

    References:

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