Previous versions of Visual Studio are not officially supported anymore.
Precompiled librairies and headers for compiling x64 executables with VS2008 :
-ftp://ftp.ihg.uni-duisburg.de/FlightGear/Win32/MSVC/fgfs-x64-VS90-3rdParty+OSG-20110116.zip
+ftp://ftp.ihg.uni-duisburg.de/FlightGear/Win32/MSVC/fgfs-x64-VS90-3rdParty+OSG-20110117.zip
Precompiled librairies and headers for compiling Win32 executables with VS2008 :
-ftp://ftp.ihg.uni-duisburg.de/FlightGear/Win32/MSVC/fgfs-win32-VS90-3rdParty+OSG-20110116.zip
+ftp://ftp.ihg.uni-duisburg.de/FlightGear/Win32/MSVC/fgfs-win32-VS90-3rdParty+OSG-20110117.zip
The VS2008 / v9.0 project files assume the directory layout below :