Export Calendars From First Class for Import to Google Calendar
Note: The export/import process may not capture all items contained with your First Class calendar. The export process can also be quite time consuming if you do select all events and tasks. Please keep this in mind as you use this feature.
To start the process of exporting your calendar from First Class, find the Calendar icon and right click with your mouse for options.
With your calendar exported the next step is to import your old First Class calendar into your new Google Calendar.