How to configure Switch Mailboxes in On Demand Migrations
In the Project, select the collection you want to switch the mailboxes.
In the next screen, click "Select Mailboxes".
In the Mailboxes Screen, click the top box to select all Mailboxes in the collection.
Click “Switch Mailboxes”.
On the New Mailbox Switch Task download the Client Update Agent, as well as choose the correct “Mail Forwarding direction” you want to use, and set the “Custom Domain for forwarding” to the correct domain.
On the Summary screen verify the information is correct and enter a name for this Switch Mailbox Task
Select "Start the task automatically when the wizard is finished."
Once the task is complete follow the instructions in the Readme.txt file from the Client Update Agent (odmclient.zip) you downloaded in step “5”.