Put yourself in the Calendar context. Go to View...Current
View...Define Views... Highlight the view you want to
modify, and click Modify... In the "View Summary" window
that comes up, go to the Other Settings... button. You can
adjust the "Time Scale" here to make it 60 minutes... Note
that this is only going to work with Day/Week/Month views,
and will need to be changed on each view...
Hope this helps!
If you right-click on the calendar, you can customize the
current view. Then under Other Settings, you can change
the Time Scale to 60 minutes. Of course this is in
Outlook XP, so it may not be exactly the same, but you
get the idea.