If we want to create our own 'share with Outlook/iCal' link we need to create an .ics file, save it somewhere and the link people to that file.

If we can save these files in our media library we don't have to use a third party for that.

Usecase here will be for a live webinar - after registration people get an email saying click here to save to Google (that is just a link) or save to iCal/Outlook which is then a link to the file in the media library