The help online from Visual Studio 2008 states that:
".NET Framework 3.5
This package installs the following:
..NET Framework versions 2.0, 3.0, and 3.5
Support for all .NET Framework versions on 32-bit (x86) and 64-bit (x64)
operating systems
Language packs for all .NET Framework versions
Service packs for .NET Framework 2.0 and 3.0
..NET Framework 3.0 is included with Windows Vista, and .NET Framework 3.5 is
included with Visual Studio 2008. It is required for all Visual Basic and
Visual C# projects that are expected to run on x86 and x64 operating
systems. Note that Visual Basic and Visual C# projects are compiled for any
CPU architecture by default. For more information, see Redistributing the
..NET Framework and Deploying 64-bit Applications.
By default, this item is selected.
"
If I deselect this item, nothing is changed and the 3.5 framework is still
required. The thing is that this framework has to be installed also on Vista
and is quite heavy. My experience is that it takes at least 15 minutes to
download and install the 3.5 framework. So I'm not sure that my fulure users
will be patient enough...
Oriane