http://blogs.msdn.com/b/ewanf/archive/2010/02/21/after-installing-visual-studio-2010-get-could-not-create-ssosql-to-fix-the-problem-reinstall-sso-or-try-regasm-ssosql-dll-from-a-visual-studio-command-prompt.aspxI rebuilt my laptop recently with Windows 7 and installed AppFabric, .net4, VS 2010, etc. When I came to configure BIzTalk 2009 I got the error in the subject line because the SSOSQL assembly needed to be re-registered. Follow the instructions hereen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/ewanf/archive/2010/02/21/after-installing-visual-studio-2010-get-could-not-create-ssosql-to-fix-the-problem-reinstall-sso-or-try-regasm-ssosql-dll-from-a-visual-studio-command-prompt.aspx#9974792Mon, 08 Mar 2010 15:24:57 GMT91d46819-8472-40ad-a661-2c78acb4018c:9974792Ewan Fairweather<p>Hi Pinaki,</p> <p>You can now with the CTP release of BizTalk 2009 R2 CTP :)</p> <p>Ewan</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=9974792" width="1" height="1">http://blogs.msdn.com/b/ewanf/archive/2010/02/21/after-installing-visual-studio-2010-get-could-not-create-ssosql-to-fix-the-problem-reinstall-sso-or-try-regasm-ssosql-dll-from-a-visual-studio-command-prompt.aspx#9967646Mon, 22 Feb 2010 21:43:08 GMT91d46819-8472-40ad-a661-2c78acb4018c:9967646Pinaki Ghatak<p>Hi Ewan.</p> <p>Interesting article. So does this mean you can use BTS 2009 with VS2010?. I'd be surprised. I'm using Win 2008 R2 server.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=9967646" width="1" height="1">