Although limit for mail message size has already been extended to 150 MB at Microsoft / Office 365 target tenant, some emails still fail to get migrated with the following error :
Message exceeded maximum message size of 112MB, skipping message. Message details: Subject: XXXXX Message ID: Path: Recoverable Items/Purges Received Date: XXXXX From: "XXXXX" To: XXXXX; YYYYY MessageSize=12
Limit for mail message size is set in ODM to migrate only up to 112 MB.
The Product Team is able to raise this message size limit to any value within ODM, but since the actual limit which is taking effect in precedence is from Microsoft Cloud, so ODM still won't be able to migrate messages size over their limit of 112MB.
Microsoft states that message is subjected to increase during transportation, the same is applicable to mail migration via ODM Portal :
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.
Please refer to this Microsoft Knowledge Base Article to address further on this query : Exchange Online limits
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