Android does not natively support opening ICS, iCal, iCalendar, or Microsoft Outlook vCalendar files. This can be
very annoying when you receive a calendar invite and can't add it to your calendar.
ICS Importer solves this. Simply download the ICS attachment and click View from your favorite Android email client and the entry will be imported into your calendar.
Supports iCal, ICS, vCalendar, Microsoft Outlook, iCalendar entries. Basically, any file that ends with .ics will work as long as it follows the vCalendar format.
I wrote this out of necessity and have spent a good deal of time making it work with different formats. If you run into a calendar file that won't work, please email me and I'll try to update the app to support your format.