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What are the different Editions of Windows Server?

Windows server have four different editions, each is specially made for different industry and may have different hardware requirements. Below is a quick over view of each edition based on Microsoft specifications:

EditionFeaturesMax number of users
Max MemoryCost
FoundationEssential server functionality without virtualization rights15 32 MBCheapest
EssentialsEssential server functionality without virtualization rights, Ideal for small companies 2564 MBReasonable
StandardAll features, with two virtual instances, ideal for small to med size companies.4 TBHigher than essentials
DatacenterHighly-virtualized private cloud environments, ideal for large companies4TBMost Expensive