Envelope Printing with Epson XP-4100

[gw1500se]

I've recently acquired an Epson XP-4100 and am trying to print envelopes (Office 2007). It is very frustrating because I cannot figure out what options to set to the address positioned properly. I am printing business sized which I think are #10. In any case the address always prints in the top middle rather than centered and the return address is missing. I've tried many options but nothing seems to work. Is there someone using an XP-4100 that successfully prints envelopes that can give me their settings? TIA.