QuickAdd is a tool to quickly add appointments to your calendar, it can be accessed by double clicking or dragging through the desired time on the calendar.
QuickAdd Dialog box
When creating an appointment with QuickAdd, use the following steps
On the Calendar section, double-click the time for the appointment or click and drag from the start time to the end time for the appointment. The QuickAdd appointment window will open
To create an all-day appointment, from the Day or Week view, go to the top of the calendar, click and drag over one or more days as required.
Enter the subject, location, and if this is a repeat appointment, select a repeat method.
Select OK. The appointment will then be marked on the calendar.
If you need to invite attendees or need the appointment to repeat, click the "More Details" option to open the Appointment page.
This feature is not available in Webmail Lite or Webmail Mobile.