Qt Open source + MSVC++ 2008

[marcel]

I downloaded and installed the qt-win-opensource-4.3.2-mingw.exe file. Was that a mistake?
Should I have downloaded the sources instead?

Yes it was. That version is for mingw only. you cannot use it with msvc.
If you really need to, then download the sources and build them. that will take some time but it will work.
When you configure the build make sure you select debug and release.

After the build and install are complete you will have to set the following env vars:
-QTDIR=your qt dir
-PATH=%PATH%;%QTDIR%\bin;
-QMAKESPEC=win32-msvc or whatever is called(maybe you'll even have to tweak it a bit, since there's no support for 2008 yet).

BTW: I am very happy to see your interest in Eclipse & open source tools.