Do you have a problem with Outlook loading when you boot the computer but it's not in the Start up folder? It's not black magic or ghosts, it's caused another program accessing Outlook's data - this causes Outlook to load.

If you have a PDA or similar device, don't put it on the cradle or connect it to the computer until you have Outlook open and are ready to sync. If it's not a PDA causing it, look over you list of programs that are loading at start up and see which one uses Outlook data - remove them from start up or disable Outlook integration features.

If you have a Sony Vaio, a bug in the BIOS loads your default email client at boot. Look on the Sony website for the bios update.