http://blogs.technet.com/b/ucedsg/archive/2010/02/25/what-are-the-hardware-requirements-for-a-combined-exchange-2010-hub-cas-role.aspxI was asked this by a school district in Minneapolis that was deploying Exchange 2010.&#160; I have seen this becoming a popular deployment option since CAS is proc heavy (3 proc cores for every 4 mailbox proc cores) and Hub is not as proc heavy (1 procen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/ucedsg/archive/2010/02/25/what-are-the-hardware-requirements-for-a-combined-exchange-2010-hub-cas-role.aspx#3432119Fri, 27 May 2011 17:50:21 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3432119Michael Bell<p>Perfect. We combined these two roles in 2007 and are planning on doing the same thing in 2010. This information is not only timely, but extremely useful. Thanks! </p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3432119" width="1" height="1">