Below are some paragraphs copied from the Microsoft Piracy Basics Q&A site. Which if true answers this query.
Quote from MS Q&A site::
Will Microsoft use activation to force me to upgrade? In other words, will Microsoft ever stop giving out activation codes for any of the products that require activation?
No, Microsoft will not use activation as a tool to force people to upgrade. Activation is merely an anti-piracy tool, nothing else.
Microsoft will also support the activation of Windows XP throughout its life and will likely provide an update that turns activation off at the end of the product's lifecycle so users would no longer be required to activate the product.