You can use Exchange Migration Tool, This tool helps the user to perform all these task easily without any data loss. By the use of this application User can migrate Exchange server 2003, 2007, 2010 directly to higher Exchange server 2010, 2013 or 2016 or on the cloud (via Office 365). This Exchange migration tool, helps to know that how much of time it will take and what is the size of exchange server. You can also utilize the computer networked together as a Agent while the migration process run simultaneously in the background.User can Easily migrate Exchange Sever Mailboxes from Source Exchange to Target Exchange, or Target to Source, or in both the ways.This Exchange Server Migration Software supported all the version of Exchange Server.Read more regarding information at - http://www.exchangeservermigration.edbtopst-converter.com/