CmdID / PowerShell / Cmdlets / Start
Start-MigrationUser
Use the Start-MigrationUser cmdlet to start the migration of a user in an existing migration batch. Exchange PowerShell reference
From the Exchange PowerShell reference 5 parameters Its page in the reference
Parameters
-IdentityThe Identity parameter specifies the email address of the user that's being migrated.-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.-PartitionThis parameter is reserved for internal Microsoft use.-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.