My app works fine when running through B4PPC on my WM5 device (.Net CF2 installed) - it sends an SMS after a button press. Once I compile it on the PC and copy it to the same location as the source code it proclaims 'Error loading external library: \My Documents\Outlook.dll. This is the correct location and also where the source code loads it. I thought it may be because I hadn't added the Outlook Desktop DLL before compiling (hadn't needed it before for what I was doing). This didn't make a difference. Anyone out there have any ideas?