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Title
ODM error: "The message exceeds the maximum supported size. Cannot save changes made to an item to store." -
Description
When migrating mail with On Demand Migration (ODM), you may see the following error:
The message exceeds the maximum supported size. Cannot save changes made to an item to store.
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Cause
The target Office 365 tenant is configured with the default message size restrictions. -
Resolution
The default message size restrictions can be changed by logging into the Office 365 Portal | Admin centers | Exchange | Recipients | ... | Set default message size restrictions
Additional information can be found in the Microsoft blog post titled, Office 365 now supports larger email messages—up to 150 MB.