Hi: You can run both the 2005 and the 2008 Express modules. They will not interfere with each other at all and you can leave your 2005 applications in the 2005 version if you want to avoid converting them to 2008. Just download and install 2008 VB or CSharp and you are good to go and you can use either the 2005 or the 2008 versions. You can UnInstall the 2005 version if you want but it is not necessary. Rick USA