The Microsoft 2XG-00153 is Windows Small Business Server Premium 2011, a 64-bit Edition designed for small businesses. This software supports up to four CPUs and five client connections.
Technical Specifications
Supports Windows Small Business Server Premium Edition 2011
64-bit architecture for improved performance
Designed for 1-4 CPU systems
Allows for up to 5 client connections
Includes a single pack DSP OEI DVD for easy installation