I am a huge fan of ICS files!

There! I said it!

ICS files (or iCalendar files) are the exchange-format for calendaring informations.

Whenever you need to transport calendaring information (Events, Todos, Free/Busy time) they are the way to go.

ICS files are defined in RFC 5545 with some additions in RFC 7986 and. a pretty good summary at iCalendar.org

The big trouble though in ran into with ICS files is the … interesting … interpretation and implementation of the standard. And yes: XKCD 927 comes to mind!

So whenever I want to use one of the lesser used features in ICS I create a test-file and import that into several calendaring tools out there. Namely Google Calendar, Outlook, Apples iCal, Thunderbird and Teamup.com

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