The VSTO development team recently announced that they has released a hotfix for Office 2007 so that we now can deploy VSTO solution to “All Users”. For Office 2010 it has been fixed while for Office 2003 it is left out.
For more information please see Deploying your VSTO add-ins to All Users. To get the hotfix for Office 2007 please see A 2007 Office system application does not load an add-in that is developed by using VSTO and Description of the 2007 Office system hotfix package (Mso-x-none.msp): October 27, 2009.
Kind regards,
Dennis
