We are migrating from Microsoft Test Manager (MTM) to TestRail. I looked at the TestRail migration tools and scripts and I didn't see an easy way to get my test cases out of MTM and into TestRail. I already wrote a program to extract MTM test cases to an Excel spreadsheet so I figured I could modify it to write it out in the XML format that TestRail could import. It works great. If anyone is interested in this let me know. I can give you the code.