MSPMD wrote:

Is there any way to change the interval in Calendar to 10 or 15
minutes from the pre-set 30 minutes intervals? I love Outlook other
than this. Most of my appointments are less than a half hour.

30 minutes is the smallest appointment interval Outlook will present to you
in the drop-down. However, if you pre-select the interval on the calendar
prior to clicking New, then the interval on the appointment will correspond
to your selection.
--
Brian Tillman [MVP-Outlook]