I have installed Windows Server 2008 and MS Exchange 2010 on one box. Each came with 30 User Cals. We have purchased additional 20 CALS each for Windows Server 2008 and Ms Exchange 2010. The Server will also be our domain controller with AD installed on it. How do I add/install the extra 20 CALs each for the Windows 2008 and Exchange 2010 ? Please Assist as I am trying to migrate to this server this week.