You will need the mini 5 pin, not 4 pin, USB male connector to normal size USB female connector. Since it appears that the keyboard you plugged in is being recognized, then probably all you need now is the Deje USB driver.
Just do a web search for "deje usb driver" and his pocketpc site should show up...
I know Takwu has some experience in this area and his post is where I got this info...
HERE