A grass roots campaign has been started by Peter Provost to get Microsoft to include unit testing support included with all versions of Visual Studio 2005 (VS). Currently, Microsoft is only including it with Visual Studio Team System (VSTS) versions of VS. This looks to be a great example of a killer feature in a product providing so much surprise and delight that people are demanding that it be universally available. This is also a great example of market segmentation by Microsoft. The irony is that there is an open source alternative that makes the opportunity cost very low, and yet people are still clamoring. Let’s see why.