Resolution:  

1)  From your Calendar folder, select New Appointment or click Ctrl+N. From any other folder, click Ctrl+Shift+A. 

2)  Enter a subject, location, start time, and end time. 

3)  Select Save & Close to save your appointment.

***Note: By default, Outlook starts and ends appointments on the hour or the half hour. If you'd like to enter a custom time, for example 12:22 p.m., click in the start or end time fields and type in the exact time you need.***