title: How to check Visual Studio 2010 Professional licence key validity
body: <p>I bought Visual Studio 2010 Professional from a third party supplier.  I input the key and it all seems to work but when starting up the program it says that it is licensed to 'Microsoft' rather than to me.</p>
  
  <p>How can I check whether the license key I was given upon purchasing Visual Studio 2010 Professional is valid?</p>