Hello SKUMAR77,
I only have general knowledge in the area of Licensing. I would recommend either posting your question in one of the Vista Answers forums (
http://social.answers.microsoft.com/Forums/en-US/category/windowsvista/).
It's also possible that the company that you bought the vista professionsl licenses from, may know the answer to your question.
Sorry I couldn't be more help,
Darin MS
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