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The Online message size limit was 25 MB (attachment size) + overheads, which roughly came out to 35 mb total message size
They are making a change to allow customers to migrate larger mail messages to Exchange Online. They now allow messages up to 150 MB to be migrated to the service. The change is available immediately to all customers and is published as a new limit in the Exchange Online limits page in the Office 365 service description.They are not changing other limits such as mailbox size or maximum send/receive limit for messages
Source: Exchange Server Pro