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The message exceeds the maximum supported size., Cannot save changes made to an item to store.

davidmeyer
2 months ago

Hello,

I'm doing a tenant to tenant migration and am getting the following error.

The message exceeds the maximum supported size., Cannot save changes made to an item to store.

The max message size is the same in both tenants. Does anyone know why this is happening?

Thanks,

David

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  • 0 2 months ago

    Also some additional details on the limits is that EWS encapsulation can add an extra 30% to a migrated message.  See the chart below which shows 112MB as 33% under the 150MB message size allowed within Office 365.

    112MB + 33% = 150MB

    Users can send and receive messages up to 150 MB to each other, provided these messages never leave Microsoft datacenters, so these can be considered as internal mails.

    Messages which are routed to outside of Microsoft datacenters are subjected to an additional 33% translation encoding expansion in size, such that in this case the maximum message size allowed is 112 MB.

    OWA accounts for the possibility that your message may be subject to the 33% encoding increase and restricts the size of message you can send to 25% less than the configured setting. For example, if you customize your settings for a 100 MB maximum message size, you can send messages no larger than 75 MB.

    Additional information ca be found here - https://learn.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#message-limits

    Doug Rain

    Technical Product Specialist

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  • 0 2 months ago

    Also some additional details on the limits is that EWS encapsulation can add an extra 30% to a migrated message.  See the chart below which shows 112MB as 33% under the 150MB message size allowed within Office 365.

    112MB + 33% = 150MB

    Users can send and receive messages up to 150 MB to each other, provided these messages never leave Microsoft datacenters, so these can be considered as internal mails.

    Messages which are routed to outside of Microsoft datacenters are subjected to an additional 33% translation encoding expansion in size, such that in this case the maximum message size allowed is 112 MB.

    OWA accounts for the possibility that your message may be subject to the 33% encoding increase and restricts the size of message you can send to 25% less than the configured setting. For example, if you customize your settings for a 100 MB maximum message size, you can send messages no larger than 75 MB.

    Additional information ca be found here - https://learn.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#message-limits

    Doug Rain

    Technical Product Specialist

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