From reasons I won\'t get into, all our unit tests are using the VSTS test framework. I now want to create an MSBuild script that runs the tests, but I don\'t want to use ms
You can execute Team System Tests (MSTest) in NUnit if you use a special NUnit Addin that recognizes the MS Test Attributes (TestClass, etc).
Exact Magic Software has an open-source "test-adapter" that can do this.
UPDATE: I've reworked Exact Magic's Msts NUnit Adapter for NUnit 2.5.2.