This update is required in order to install SharePoint Server 2010 on Windows Server 2008 R2.
"The ADO.NET Data Services framework consists of patterns and libraries that enable the creation and consumption of REST-based data services for the web. This update to the Microsoft .NET Framework 3.5 SP1 provides additional features which extend the functionality provided in version 1.0 of the ADO.NET Data Services framework."
Microsoft (2010). ADO.NET Data Services Update for .NET Framework 3.5 SP1 for Windows 7 and Windows Server 2008 R2. Retrieved January 3, 2011 from http://www.microsoft.com/downloads/details.aspx?FamilyID=79D7F6F8-D6E9-4B8C-8640-17F89452148E&displaylang=fi&displaylang=en.
Microsoft (2010). A hotfix for the.NET Framework 3.5 Service Pack 1 is available for Windows 7 and for Windows Server 2008 R2 as a prerequisite for Microsoft Office SharePoint Server 2010. Retrieved January 3, 2011 from http://support.microsoft.com/kb/976462.