Did you know that you can specify the Increments on the Daily Calendar? By default, the Daily Calendar (Go To | Calendar) divides the day into thirty minute increments. Some businesses (especially those with a lot of Phone Call volume) may wish to set this to fifteen minutes.
To do this:
1. Select Tools | Options from the top level menu
2. Select the Calendar tab.
3. Drop down the "Increment Time By" list and select your desired increment
4. OK your way out.