Not sure why the internets failed me again, but I had to resort to registry searching to find this one. For Outlook 2007, to run the “Mail” control panel applet from the command line, use the following:
rundll32.exe shell32.dll,Control_RunDLL “C:\Program Files\Microsoft Office\Office12\MLCFG32.CPL”
I needed this so I could run the applet as a different user. Worked like a charm!