Possible Duplicate: Can you help me with my software licensing question? Microsoft action pack subscription(MAPS) offers that many internal use of softwares, especially windows server 2008 R2 Ent 1 license with 10 CALs. Total cost is 329$ But when I looking for microsoft licensing and pricing guide, windows server 2008 r2 ent edition costs 3919$ with 25 cal. Do we really need to buy windows enterprise edition?