How to Migrate Permissions?
In the Migrate Permissions feature, you can migrate permissions (Full Access, Send As and Send On Behalf) from on-premise mailboxes to Office 365 Mailboxes.
Perform the following steps to Migrate Mailbox Permissions:
Select Office 365 Manager from the available vertical tabs. Then from left side of the application, select Mailbox Permissions and click on Migrate Permissions.
On selecting "Migrate Permissions", a pop - up window is displayed as shown below:
 

     
  • Enter the Exchange Server Name, User Name and its Password to connect to Exchange Server. Then click on Next button to proceed.

     
Choose the mailbox for which we have to set the permission from On-premise to Office mailboxes and Click on Apply button.