Learn more about .csv migrations

 

You can generate a .csv file containing a list of mailbox identities from the local database or source forest. Then, you can pipe the content of this file into the script to bulk-create the target mail-enabled users.

For example, the content of the .csv file can be:

EmailAddress

Ian@contoso.com

John@contoso.com

Cindy@contoso.com

For more information about local or cross-forest moves, see Mailbox moves in Exchange 2013, CSV files for Mailbox migration and Manage on-premises moves.