Calling an Add-in method from another Application Anyone for Coffee? 3/10/2007 1:16:08 AM ref: http://www.microsoft.com/communities/newsgroups/list/en-us/default.aspx?&lang=en&cr=us&guid=&sloc=en-us&dg=microsoft.public.outlook.program_addins&p=1&tid=6836500a-e234-489f-b464-19e70f3a855c&mid=6836500a-e234-489f-b464-19e70f3a855c Wierd. Do replied to items not pop up to the top? I posted a reply to a message but no-ones going to read it cos it's on page 4. So apploogies for posting it again, but... My application attempts to use the externally available call can't seem to get hold of the add-in. I get the following exception: System.Runtime.InteropServices.COMException (0x80010001): Call was rejected by callee. (Exception from HRESULT: 0x80010001 (RPC_E_CALL_REJECTED)) The calls I am making are: Outlook.ApplicationClass olApp = new Outlook.ApplicationClass(); Outlook.NameSpace olNS = olApp.GetNamespace("MAPI"); MSOffice.COMAddIns addIns = olApp.COMAddIns; I do not get he error if Outlook is running before my application starts. I suspect this is something to do with me trying to access the AddIn before it is loaded - does that sound plausable? Any thoughts on what I should do? Thanks