http://msmvps.com/blogs/carlosq/archive/2008/03/28/mz-tools-articles-series-howto-removing-commands-and-ui-elements-during-visual-studio-net-add-in-uninstallation-updated.aspxI have updated a quite old but useful article (Feb 2005) to document the new /ResetAddin command-line flag of Visual Studio 2005/2008 and how to do it correctly: HOWTO: Removing commands and UI elements during Visual Studio .NET add-in uninstallationenCommunityServer 2008.5 SP2 (Build: 40407.4157)