El Reg: Microsoft threatens its Most Valuable Professional

"What's the best way to attract a pile of threatening lawyers' letters from Microsoft? Sell pirate copies of Windows? Write a DRM-busting program?

Londoner Jamie Cansdale has just discovered a new approach. He had the temerity to make Redmond's software better.

As a hobby, Cansdale developed an add-on for Microsoft Visual Studio. TestDriven.NET allows unit test suites to be run directly from within the Microsoft IDE. Cansdale gave away this gadget on his website, and initially received the praises of Microsoft. In fact, Microsoft was so pleased with him, it gave him a Most Valuable Professionals (MVP) award, which it says it gives to "exceptional technical community leaders from around the world who voluntarily share their high quality, real world expertise with others".

However, his cherished status did not last. In December 2005, he started getting emails from a Microsoft executive called Jason Weber. The problem was that TestDriven.NET supported the Express edition of Visual Studio. Express is the cut-down version that anyone can download for free from the Microsoft website. But MS doesn't want you supporting Visual Studio Express with your add-ons.

Weber wrote to Cansdale that he had violated Express licence agreements: that he was accessing APIs not available to those who only had the Express version of Visual Studio, or that he had reverse engineered APIs - also forbidden.

Cansdale said from the off - and has stuck by this - that he only used APIs in the public domain, published on Microsoft's MSDN website for all to see. He invited Weber to be specific about the API/licence term that was violated. Weber blanked him, and then began an exchange of increasingly acrimonious correspondence".

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