Overview
An ics. file is an iCalendar (iCal) file that can be saved to external calendars.
When receiving an email invitation from the Events application, the event .ics file will be attached along with the event details. Add the file to your external calendar so that it appears there:
1. Adding an iCal (.ics) file in Outlook
In the email invite, click on the ics. file and it will open your personal Outlook Calendar. From there, you can add the event by selecting 
:
2. Adding an iCal (.ics) file in Desktop Mac or PC
In the email invite, double-click on the mail attachment (.ics file):
Accept the event in your Mac calendar or PC Desktop Calendar:
3. Adding an iCal (.ics) file in Mobile
In the email invite, tap on the mail attachment (.ics file);
Add the event to your Mobile calendar:
