http://blogs.msdn.com/b/virtual_pc_guy/archive/2008/07/14/confusion-over-multi-processor-guest-os-support-with-hyper-v.aspxAfter posting a link to our supported guest operating system list ( http://support.microsoft.com/kb/954958/en-us ) I have received a number of queries about the issue of multi-processor support.&#160; You see, while we state that we only support Windowsen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/virtual_pc_guy/archive/2008/07/14/confusion-over-multi-processor-guest-os-support-with-hyper-v.aspx#8750171Fri, 18 Jul 2008 19:52:47 GMT91d46819-8472-40ad-a661-2c78acb4018c:8750171Tom<p>The word &quot;support&quot; has really become diluted with the open-source community, which has appropriated the word to mean &quot;it works.&quot; &nbsp;I sort of feel that every time Microsoft uses &quot;support,&quot; the word should be highlighted and link to a definition which clarifies the difference between &quot;supports&quot; and &quot;works.&quot;</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=8750171" width="1" height="1">http://blogs.msdn.com/b/virtual_pc_guy/archive/2008/07/14/confusion-over-multi-processor-guest-os-support-with-hyper-v.aspx#8742470Thu, 17 Jul 2008 09:52:20 GMT91d46819-8472-40ad-a661-2c78acb4018c:8742470Benjamin Armstrong<p>John - </p> <p>Good question, let me post on that another day :-)</p> <p>Cheers,</p> <p>Ben</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=8742470" width="1" height="1">http://blogs.msdn.com/b/virtual_pc_guy/archive/2008/07/14/confusion-over-multi-processor-guest-os-support-with-hyper-v.aspx#8738134Wed, 16 Jul 2008 14:51:26 GMT91d46819-8472-40ad-a661-2c78acb4018c:8738134John Paul Cook<p>What about licensing issues? Isn't retail XP licensed for 1-2 processors? What if four virtual processors are allocated to it?</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=8738134" width="1" height="1">