Solving could not load type error with ListData.svc in SharePoint 2010 RTM

If you encounter the following error when you access the listdata.svc service in SharePoint Server 2010 RTM -

Could not load type 'System.Data.Services.Providers.IDataServiceUpdateProvider' from assembly 'System.Data.Services, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

you are probably missing the latest update of ADO.NET Data Services for .Net Framework 3.5 SP1. There are two versions -

• ADO.NET Data Services Update for .NET Framework 3.5 SP1 for Windows 7 and Windows Server 2008 R2
• ADO.NET Data Services Update for .NET Framework 3.5 SP1 for Windows 2000, Windows Server 2003, Windows XP, Windows Vista and Windows Server 2008.

Apparently this is not picked up by the prerequisites installer.

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