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Error when you try to migrate a user's mailbox data from the on-premises environment to Office 365: "This mailbox exceeded the maximum number of large items that were specified for this request."
Article ID: 2584294 - View products that this article applies to.
Not sure what release of Office 365 you're using? Go to the following Microsoft website:
Am I using Office 365 after the service upgrade?
You use one of the following to try to migrate a user's mailbox data from your on-premises messaging environment to Microsoft Office 365:
This issue occurs if the user's mailbox contains one or more messages that exceed the 35-megabyte (MB) message limit.
FailureType : TooManyLargeItemsPermanentException
FailureSide : Target
Message : Error: This mailbox exceeded the maximum number of large items that were specified for this request. --> MapiExceptionMaxSubmissionExceeded: IExchangeFastTransferEx.TransferBuffer failed (hr=0x80004005, ec=1242)
To fix this issue, locate and remove messages that are larger than 35 MB from the user's on-premises mailbox. To do this, follow these steps:
For more info about how to import items into Outlook in Office 365, go to the following Microsoft websites:
Still need help? Go to the Office 365 Community
Article ID: 2584294 - Last Review: May 15, 2013 - Revision: 8.0