http://blogs.msdn.com/b/jasonjoh/archive/2007/11/29/making-sense-of-patching-hmc-4-0.aspxPatching HMC has never been a fun process. Unlike most Microsoft products, HMC patches don't come in nice neat installer packages that can just be installed on top of your existing setup. This causes some consternation, since we're used to being ableen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/jasonjoh/archive/2007/11/29/making-sense-of-patching-hmc-4-0.aspx#7077241Fri, 11 Jan 2008 20:52:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:7077241JasonJoh's [MSFT] WebLog<p>Yes, Exchange 2007 SP1 is out . No, it has not been cleared with HMC 4.0 yet. At this point you should</p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=7077241" width="1" height="1">