InfoPath is a great tool in the VSTO toolkit. There are two ways you can write managed code behind an InfoPath form. First, you can use Visual Studio Tools for Applications which ships on the Office CD with InfoPath 2007. VSTA provides a nice integrated experience and may remind you of the VBA experience of putting code behind things. VSTA is a slimmed down version of Visual Studio that has been optimized for integration into applications that need a customization or extension experience. In particular, VSTA does a lot for applications written in managed code as it