During Migration, the following error is generated:
Error: "The message exceeds the maximum supported size"
Message size limitations on O365 / Exchange
The maximum value is 150 MB.
Refer to the Microsoft announcement (https://blogs.office.com/en-us/2015/04/15/office-365-now-supports-larger-email-messages-up-to-150-mb/) to find out how to change these limits on individual mailboxes.
Exchange 2010 and higher:
By default, On-Premises Exchange Servers do not accept items larger than 30 MB. In order to be able to migrate larger messages, you may need to increase EWS send and receive limits on corresponding servers.
This includes changing of per-mailbox limits as well as changing of EWS transport limits and IIS configuration.
To increase the limit on a mailbox use the following command in Exchange Management Shell:
Get-Mailbox | Set-Mailbox -MaxReceiveSize 200MB -MaxSendSize 200MB
To increase transport limits:
Get-ReceiveConnector | Set-ReceiveConnector -MaxMessageSize 200MB
Set-TransportConfig -MaxReceiveSize 200MB -MaxSendSize 200MB
Finally, increase EWS virtual directory network limits on Client Access Server roles.
For this follow instructions described in official documentation:
You will be required to change values of all occurrences of the following properties in EWS Web.config file:
On Demand Migration For Email:
There are message size limits in place on ODME as well. Once the settings have been increased on your mail environment, you can access the Options - Advanced section of your plan and adjust the Maximum message size.
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