How to get error 440 when logging into Outlook

Question

아웃룩에 로그인 시 밑에 에러가 발생합니다.

안전모드로는 접속이 되는데 일반모드 실행 시 자동으로 실행이 바로 꺼집니다.

새 계정 만들어 접속하면 켜지는데 기존에 사용하던 아이디로 로그인하면 실행이 안됩니다.

추가기능에서 com추가 기능 이동 해도 해결 안됨

크롬 쿠기 전체 삭제해도 실행 안됨

다른 엑셀이나 워드 PPT 는 실행 잘됨

제발 해결해 주세요

UTC Date: 2026-03-22T23:49:29.558Z
Client Id: 20C3067082404DD0ABBB985CEB81F81B
Session Id: 7c5092da-32dd-4d45-89e8-34cbfd3ea6bc
Client Version: 20260313003.08
BootResult: fail
Back Filled Errors: None
err: Error: 440
esrc: StartupData
et: ServerError
estack: Error: 440
    at Object.y [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.d7a889c9.js:2:299125)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.d7a889c9.js:2:23649
st: 440
efe: SE2P216CA0135

Answer 1

Error 440 in this context is an Automation error raised by Outlook when accessing an object or property during startup. It is typically caused by a failure in an add-in, profile-specific data, or a disabled component for that specific account.

Because Outlook works in Safe Mode and with a new profile, but fails only with the existing account in normal mode, the problem is isolated to data or components tied to that original profile/account.

Based on the available information, the supported actions are:

1. Treat this as an Automation error (440)
   • Error 440 occurs when a method or property on an Automation object fails and the error is reported by the application that created the object.
   • Use error handling to identify the failing object if running VBA or custom code: enable On Error Resume Next before the suspected call, then inspect the Err object immediately after to see the source and description.
   • If any custom VBA, COM automation, or macros are associated with this Outlook profile, disable or remove them for that account and test again.
2. Check for disabled or blocked add-ins at the admin level
   • Error 440 can also occur if an Office add-in required by that account has been disabled by a system administrator.
   • Confirm with the administrator (or local policy) that no required Outlook add-ins for that mailbox are disabled.
3. Use the working profile as a workaround
   • Since a new Outlook profile works, continue using that new profile for the affected mailbox as a practical workaround while investigating any custom automation, macros, or add-ins tied to the old profile.

If the environment uses Exchange Online or Outlook.com and the issue persists only for that mailbox, and no custom automation is present, open a support case through the Microsoft 365 Admin portal so support can review service-side issues for that specific mailbox.

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References:

• Automation error (Error 440)