Inbox folder message rules returns 500 with "An internal server error occurred. The operation failed., Index was outside the bounds of the array."

Question

Inbox folder message rules returns 500 with "An internal server error occurred. The operation failed., Index was outside the bounds of the array."

Elva Nguyen 0

Hi,

Describe the bug
I use Graph API to request user's inbox message rules and see that it failed for a few of the users with the response:
"An internal server error occurred. The operation failed., Index was outside the bounds of the array." with status code 500
This error seems to occur consistently with certain user. When I check user's data, there's nothing stand out that can help me troubleshoot this.

The request that I sent is https://graph.microsoft.com/v1.0/users/[user-id]/mailFolders/Inbox/messageRules?$top=999

Expected behavior
User's inbox message rules are returned

Thank you!

Glen Scales 4,446 Reputation points

2023-10-19T00:08:57.79+00:00

You potentially have some corruption of the Rules, try using https://learn.microsoft.com/en-us/powershell/module/exchange/get-inboxrule?view=exchange-ps to see if that error similarly. If it does you may need to use MFCMapi to look at rules table and work out what might be wrong. Rules are an attack vector https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/detect-and-remediate-outlook-rules-forms-attack?view=o365-worldwide so I'd do some investigation first.

Your answer

Glen Scales 4,446 Reputation points

2023-10-19T00:08:57.79+00:00

You potentially have some corruption of the Rules, try using https://learn.microsoft.com/en-us/powershell/module/exchange/get-inboxrule?view=exchange-ps to see if that error similarly. If it does you may need to use MFCMapi to look at rules table and work out what might be wrong. Rules are an attack vector https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/detect-and-remediate-outlook-rules-forms-attack?view=o365-worldwide so I'd do some investigation first.

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Inbox folder message rules returns 500 with "An internal server error occurred. The operation failed., Index was outside the bounds of the array."

Your answer