I have a related question that you touched on. My printer (HP a410c) does print on both sides. However, as far as I know, it does so when copying from the glass. I don't see a way to print both sides and in booklet form when sending a directory from my computer.
Any ideas? Have you run into this before?
Whether or not a printer will print duplex is a matter of two things:
1. The hardware. Evidently your printer (I'm assuming an inkjet) does have that capability.
2. The Printer Driver ... the driver should have settings that will allow you to print duplex. I would check your printer manual to be sure.