I am fairly certain you could also delete the shortcut "poutlook" in \Windows\StartUp. This is why/how ActiveSync starts at power on. You may have to do the rename and then delete trick if you get the message that it can't be removed.
LG Optimus G, Nitro HD, Samsung GS3, GS2 Skyrocket, Infuse, HTC One X, Inspire, Surround, HD7S, Xperia Play. iPhone 1st gen, 3G, 3GS, 4, 4S and 5.