Microsoft Outlook does come with a default Calendar, but you can create other Outlook calendars. For example, you can create new outlook calendar for your personal appointments, separate from your work calendar.
To create a new calendar do the following.
Open your calendar
On the menu, click on Open Calendar and select Create New Blank Calendar
You can also create a new calendar by right clicking on your current calendar and select New Calendar
In the Name box, type a name for the new calendar and click ok
New Calendar is created and will appear in the Calendar Navigation Pane