EdbMails ensures a 1:1 copy of the source mailboxes at the target servers. It doesn’t modify or omit any data present in the source server. This makes sure that users can continue to access the mailbox data even when the migration is going on. As the data in original mailboxes remain untouched, It ensures a reliable and risk free migration.
Visit : https://www.edbmails.com/pages/exchange-migration.html