How to get error 440 when logging into Outlook

Question

How to get error 440 when logging into Outlook

han 0

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

Locked Question. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

Daniel Clegg 0 Reputation points

2026-03-25T13:40:40.39+00:00

Had the same issue! Fixed by running the below and waiting 10 mins

PS C:\WINDOWS\system32> Get-Mailbox "user@domain" | Format-List AccountDisabled

AccountDisabled : True

PS C:\WINDOWS\system32> Set-Mailbox "user@domain" -AccountDisabled:$false

PS C:\WINDOWS\system32> Get-Mailbox "user@domain" | Format-List DisplayName,AccountDisabled

DisplayName : user@domain

AccountDisabled : False

swey 11

Translation:

I get the error below when I log in to Outlook.
I can log in in Safe Mode, but when I run it in Normal Mode, it automatically closes right away.
If I create a new account and log in, it works, but if I log in with my existing ID, it won’t run.
Moving the COM add-in to the Add-ins section didn’t solve the problem.
It still won’t run even after deleting all Chrome cookies.
Other programs like Excel, Word, and PowerPoint run fine.
Please help me fix this.

Next Step:

Set-CASMailbox "******@contoso.com" -MAPIEnabled $true
Set-CASMailbox "******@contoso.com" -OWAEnabled $true
Set-CASMailbox "******@contoso.com" -ActiveSyncEnabled $true

Now i get this:

BootResult: configuration
Back Filled Errors: Unhandled Rejection: Error: 500:undefined|undefined:undefined
err: Microsoft.Exchange.Data.Storage.AccountDisabledException
esrc: StartupData
et: ServerError
estack: Error: 500
    at Object.w [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.78ff2eb0.js:1:806)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.78ff2eb0.js:1:192762
st: 500
ehk: X-OWA-Error

Hornblower409 16,350 Reputation points

2026-09-09T13:59:29.2733333+00:00

@swey said

Now i get this: Error: 500

You will not get any help for your issue by adding to an old post. You must start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem and the steps you have already tried to fix it.

(You can put the link for this page in your new Question for reference)

1 answer

Daniel Clegg 0 Reputation points

2026-03-25T13:40:40.39+00:00

Had the same issue! Fixed by running the below and waiting 10 mins

PS C:\WINDOWS\system32> Get-Mailbox "user@domain" | Format-List AccountDisabled

AccountDisabled : True

PS C:\WINDOWS\system32> Set-Mailbox "user@domain" -AccountDisabled:$false

PS C:\WINDOWS\system32> Get-Mailbox "user@domain" | Format-List DisplayName,AccountDisabled

DisplayName : user@domain

AccountDisabled : False
swey 11 Reputation points

2026-09-08T20:26:43.82+00:00

Translation:

I get the error below when I log in to Outlook.
I can log in in Safe Mode, but when I run it in Normal Mode, it automatically closes right away.
If I create a new account and log in, it works, but if I log in with my existing ID, it won’t run.
Moving the COM add-in to the Add-ins section didn’t solve the problem.
It still won’t run even after deleting all Chrome cookies.
Other programs like Excel, Word, and PowerPoint run fine.
Please help me fix this.

Next Step:

Set-CASMailbox "******@contoso.com" -MAPIEnabled $true Set-CASMailbox "******@contoso.com" -OWAEnabled $true Set-CASMailbox "******@contoso.com" -ActiveSyncEnabled $true

Now i get this:

BootResult: configuration Back Filled Errors: Unhandled Rejection: Error: 500:undefined|undefined:undefined err: Microsoft.Exchange.Data.Storage.AccountDisabledException esrc: StartupData et: ServerError estack: Error: 500 at Object.w [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.78ff2eb0.js:1:806) at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.78ff2eb0.js:1:192762 st: 500 ehk: X-OWA-Error
Hornblower409 16,350 Reputation points

2026-09-09T13:59:29.2733333+00:00

@swey said

Now i get this: Error: 500

You will not get any help for your issue by adding to an old post. You must start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem and the steps you have already tried to fix it.

(You can put the link for this page in your new Question for reference)

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:

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.
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.
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.

References:

Automation error (Error 440)