Hi I have an Outlook 2007 add-in developed in Visual Studio 2008 and deployed with ClickOnce. It is not deployed to the IIS it´s deployed to a network share. The Add-in works fine on to XP machines but we have another completly new XP machine with SP 3 and all the new downloads from Windows Update. The Add-in does not load and when i look at it in the COM Add.ins manager the error message is "A runtime error occured during the loading of the COM add-in". On the two machines that the add-in works i have installed another Outlook 2007 with VS2005 for another project if that have something to do with it. The target framework for the add-in is .NET 3.5 Does anybody now where to start? I have looked in the Outlook logs an they don´t say anything.