Here is a nice (free) tool from microsoft called "Speech Recognition Profile Manager Tool".
You can download it at the following address:
http://www.microsoft.com/en-us/download/details.aspx?id=22358You can use it to Import/Export speech profiles from any Windows system to another Windows system, so you won't need to re-train your speech profile when you move to a new system.
This should be particularly useful for people with strong accents, or those who are trying to use other languages with the English engine.
Thanks to Kalle for pointing it out to me.