I only have 2007 but did not see anyway to do this. If you select daily, you can only select the time and number of recurring entries. I also did a search and didn't find anything, but your parameters, and mileage, may vary depending on what the search engine gods throw at you when you search ("Outlook 2003" +recurrence +"same day" had 3000 hits on Google).
I will check with some of our Outlook gurus at UNCC tomorrow. and let you know if they have come across this.
Dewey