Opening an ICS file on every device
The viewer above shows you the contents without writing anything to your calendar. To take the events over, import the file into your calendar:
Outlook (Windows)
Classic Outlook: double-click the file or File → Open & Export → Import/Export → "Import an iCalendar or vCalendar file". New Outlook and Outlook on the web: Calendar → Add calendar → Upload from file.
Google Calendar
On a computer at calendar.google.com: gear → Settings → Import & export → select file and target calendar. The Android and iPhone apps have no file import.
Apple Calendar (Mac, iPhone, iPad)
Mac: double-click or File → Import. iPhone/iPad: tap the file in the mail attachment and choose "Add All"; from the Files app use Share → Calendar.
Worth checking before you import
- Are the times right? The viewer warns about missing or unknown time zones.
- Is it an invitation (METHOD:REQUEST)? Your calendar may then reply to the organizer automatically.
- How many events are there? A full calendar export otherwise lands unnoticed in your main calendar; better create a separate calendar first.