Duplex printing in Outlook 2003 is broken and pages are not
printed as you would expect them to be for booklets. This is expected to be
fixed in Outlook 2003 SP2 but if you can't wait for the release of SP2 later
this fall, you can call for the hotfix.
More information about the hotfix is found in
http://support.microsoft.com/?kbid=892404.
Not sure how to get a hotfix? See
http://www.outlook-tips.net/archives/2004/20041011.htm