Google-calendar – How to add a non-Gmail account to the Google calendar

If it has the ics file attached to the email, then you could import it into Google: http://www.google.com/support/calendar/bin/answer.py?answer=37118

You should be able to save this calendar, in its current state, in iCal (or XML) format and then you can import it as a static calendar.

1. Go to "Calendar Settings" for this calendar (dropdown menu)
2. Under "Calendar Address" pick ICAL.
3. You get prompted with the URL - Click it.
4. Save the file locally
5. On the "Other calendars" dropdown, pick "Import calendar" and select the calendar file you've just saved. This will upload all events to an existing calendar, so if you'd like to duplicate the calendar you just saved, you need to first create a new calendar, then choose that calendar upon import.