How do I sync my Outlook 2007 calendar with my PPC 2003?

I've got Outlook 2007 on my vista business PC with WMDC 6.1 installed.

I can connect fine, and the calendar seems to sync with my default calendar,
named calendar,
but what I really want is to merge all of the calendars in my calendars, (in
fact, there's really only just one additional calendar in my case) and get
them onto the mobile device.

There doesn't seem to be a way to do this.

If I import the .ics file for the calendar into my calendar, when I import
the update I get duplicate appointments.

Is there a way to do this, and get it useable?

Tony