http://blogs.msdn.com/johnbreakwell/archive/2009/01/20/unable-to-install-msmq-http-support-0x80070003.aspxYou may see the following error message when you are trying to install HTTP support for MSMQ messaging: "The Message Queuing IIS extension /LM/W3Svc/1/Root/MSMQ cannot be created. Message Queuing will not be able to receive HTTP Messages. Error Code 0x80070003en-GBCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/johnbreakwell/archive/2009/01/20/unable-to-install-msmq-http-support-0x80070003.aspx#9534033Mon, 06 Apr 2009 19:39:18 GMT91d46819-8472-40ad-a661-2c78acb4018c:9534033Marcelo Carvalho Fernandes<p>Very useful post John !!!</p> <p>I had a similar problem today. When installing MSMQ for an application that would not use the MSMQ's HTTP support and that the default web site have been removed. The solution would be the one you suggested, that is, create a new web site and move it to the position of default web site. Since we don&#180;t use the HTTP support, we have disabled this option when installing MSMQ.</p> <p>Thanks a lot !</p> <p>Marcelo Carvalho Ferndes</p>http://blogs.msdn.com/johnbreakwell/archive/2009/01/20/unable-to-install-msmq-http-support-0x80070003.aspx#9534051Mon, 06 Apr 2009 19:49:11 GMT91d46819-8472-40ad-a661-2c78acb4018c:9534051JohnBrea<p>Hi Marcelo,</p> <p>Glad I could help.</p> <p>Yes, only install the MSMQ options that you will actually be using. </p> <p>Cheers</p> <p>John Breakwell</p>