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    Home > Exchange Online to Exchange Online Migration Process > Preparation > 7. Handle large mail items for migration to destination mailboxes

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    7. Handle large mail items for migration to destination mailboxes

    - Microsoft sets a default limit of 35 MB as the maximum size of a received message. We recommend increasing this to 150 MB before the migration to avoid any potential exceptions. Refer to to configure the limit. Sample PowerShell command:

    Set-Mailbox -Identity user@contoso.com -MaxReceiveSize 150MB

    - Other limits such as rule quota limitation. Inbox rules are limited to 256 KB for all rules. Refer to to configure the limit. Sample PowerShell command:

    Set-Mailbox -Identity user@contoso.com -RulesQuota "<32 KB to 256 KB>"