OS Services Booking has feature to generate the iCalendar (.ics) files and send them to Customers, Administrator and Employees. You can import those iCalendar files into your calendars from websites or calendar programs that support the .ics file format, such as Apple iCal, Google Calendar, and Mozilla Lightning.

This is a screen of Outlook Calendar when we click on the iCalendar files from Booking confirmation emails.

To use this feature, you should enable configure option: Generate ICS file in OS Services Booking Configuration page.