For those people that were unaware, the Windows group released a Product Activation Announcement regarding the changes and impacts to Windows Server 2008 method of activation.  Since Windows Server 2008 uses the same activation method as Windows Vista, the error codes reported for Windows Server 2008 are the same used in Windows Vista as mentioned in the article below:

938450  How to troubleshoot Volume Activation error codes on Windows Vista-based computers

The new method of activation designed for volume license customers is Volume Activation (VA) 2.0.  This method provides two types of customer-specific keys, namely Multiple Activation Key (MAK) and Key Management Service (KMS) Key.  As stated in article ID:  938450, most of these errors would require customers contacting the Product Activation (PA) Call Center at either:

+1 (716) 871-2929 or toll free +1 (888) 571-2048 to validate, unblock and reissue the current KMS/MAK keys.

For more technical and planning information regarding  Volume Activation 2.0, please click on the following link: 
    http://technet.microsoft.com/en-us/library/bb892849.aspx

Author:  Mike Rosado
Support Engineer
Microsoft - Windows Server - Enterprise Platforms Support - Core team (Setup, Cluster and Performance)