Better with Microsoft Office SharePoint Server
Microsoft Office SharePoint Server on the Windows Server 2008 R2 high-end editions platform provides a scalable solution as:
Numbers of users increase into the hundreds of thousands or millions.
You move from hundreds of gigabytes to terabytes.
You consolidate and migrate data to your SharePoint Server deployments.
Complex business demands with high-computing requirements.
When planning for SharePoint Server deployments for the Internet or medium-to-large intranets, consider Windows Server high-end editions to enable high-availability scenarios, such as clustering and scale-up scenarios.
SharePoint Server deployments are designed to scale out and up. In your planning, it is best to consider where the deployment potential is when purchasing Windows Server 2008 R2. Windows Server is designed for scale and performance, and provides the best scale opportunities as you add headroom for RAM and CPUs for a future need.
Security and Identity
As you support diverse and complicated multi-forest environments, combine the best of Microsoft Office SharePoint Server 2007 and Windows Server high-end editions for simplified Active Directory Federation environments.
Evaluate Windows Server 2008 R2
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