Microsoft .NET Framework 3.5 SPI is an application needed for some software and applications in order for it to function well. This is an alternative mirror for anyone having problem accessing the Microsoft website. The newest version for 2008 is 3.5 SPI which is a combination of .NET Framework 2.0 service pack 1 and 3.0 service pack 1. The new technologies including Windows Card Space, Windows Communication Foundation, Windows Work Flow and Windows Presentation Foundation. Download the Microsoft .NET 3.5 SPI from this website. If you wish to uninstall the freeware in the future just go to Windows Features Control Panel in your PC.