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My organization has purchased enough Server 2000 CALs to be fully licensed through the Open License program. We are now looking into moving to Server 2003. Do we need to purchase a whole new set of CALs or is there any upgrade path or upgrade pricing we should be entitled to? (And no, SA was not purchased with the Server 2000 CALs). 
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My organization has purchased enough Server 2000 CALs to be fully licensed through the Open License program. We are now looking into moving to Server 2003. Do we need to purchase a whole new set of CALs or is there any upgrade path or upgrade pricing we should be entitled to? (And no, SA was not purchased with the Server 2000 CALs). 

Licensing for Server 2000 to Server 2003

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).