What are V1, V2 and V3 templates?
With Server 2008, 3 versions of certificate templates exist: Version 1 certificate templates were introduced with Windows Server 2000 and cannot be modified. It is only possible to set the user access rights. Version 2 certificate templates were introduced with Windows Server 2003 and can be individually configured. Version 3 certificate templates were introduced with Windows Server 2008 and support the new Microsoft Crypto-API with new encryption and hash algorithms. Only Windows Server Enterprise or Datacenter Editions can issue certificates using V2 or V3 certificate templates.