How can we migrate users from exchange server 2010 to new exchange server 2013. The two exchange environments are different. Once we installed new exchange server 2013, how do we import all exchange 2010 users mails into new exchange 2013.

• Moved by Jason Johnston [MSFT]Microsoft employee Monday, April 13, 2015 2:05 PM Not a development question.

http://msexchangeguru.com/2013/11/03/e2013crossforestmigration/

I believe this is what you're looking for.