windows server 2008 standard retail box

Windows Server 2008 Enterprise
Windows Server 2008 Enterprise provides unprecedented levels of system uptime, the latest security advances, and the scalability to support the growth of mission-critical applications. It also provides a cost-effective way to realize the benefits of virtualization.
Windows Server 2008 Enterprise is an optimal operating system for servers running applications such as networking, messaging, inventory, databases, and customer service systems.
High Availability
Providing uninterrupted business services to employees, vendors, and partners around the clock has become a critical business factor for global businesses. Remote employees and international customers and partners need to have continuous access to systems and data. A disruption in services can result in diminished productivity and lost opportunities.
Windows Server 2008 Enterprise provides high availability for mission-critical applications such as databases, messaging systems, and file and print services through such features as failover clustering, Server Core, fault-tolerant memory synchronization, and cross-file replication (DFS-R).