Organization Name during Coexistance

Hi,

I am planning to install exchange 2013 and coexistence with exchange 2010 , In my exchange 2010 my exchange organization name is "FirstOrganization" (no space between words )so while preparing AD for exchange 2013 , should i mention the same organization name or i can directly run PrepareAD command and that will not effect my coexistence.

Regards
Usman Ghani

Usman Ghani - MCITP Exchange 2010