Hi,

We have Exchange online high-bride deployment. Problem is after migrate on-premise exchange (Exchange Version is Exchange 2013) user to office365 user attachment size is different. We are run below command in our on-promise exchange server and exchange online result isdifferent.

below display Same User Result

on-promise exchange (Exchange 2013)

Exchange Online

Issue is user get an on-promise exchange server Max send and Receive Size. After Change on-promise side it is effected online. Why this action is not effect automatically after migrate.

Thanks.

They are two different organizations after all. To control this in EO, you can set the defaults on the Mailbox plan:

Get-MailboxPlan | Set-MailboxPlan -MaxSendSize 5MB -MaxReceiveSize 5MB

To change this on mailboxes that are already moved/created, use this:

Get-Mailbox -RecipientTypeDetails UserMailbox -ResultSize Unlimited | Set-Mailbox -MaxReceiveSize 5MB -MaxSendSize 5MB