Purchase Recovery and Migration Manager along with the Add2Exchange Toolbox.
2.
Download latest version of full version of Add2Exchange.
3.
Unzip the installation MSI file to a local directory.
4.
Run the preinstaller tool as described in Automated Exchange 2007/2010/2013 Configuration, however click the Account Exists checkbox next to the account name. Run it on the target server. You can see a video tutorial for running the preinstaller at: Tutorials.
5.
Create shared folder on target server. Give the Service Account Full Control permissions over the directory.
6.
Plan on a standard amount of downtime, typically an hour in addition to the time for a Mailbox and/or public Folder move.