I couldn't find any option to export my calendar in Outlook 2010 as a ical file. Is there such an option in Microsoft Outlook 2010?
2 Answers
File -> Save Calendar. It saves the file as .ics which is the standard iCalendar file format used by the iCal app.

http://en.wikipedia.org/wiki/ICalendar
Before you Save, click on MORE OPTIONS to change the Date Range and Details. Otherwise the default Date Range is "Today".
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Note that "Save Calendar" will rename all your appointments to "Busy" or "Tentative" with no explanation. A better way is to go to File -> Open -> Import Choose "Export to file" Export your calendar to a CSV file. It will prompt you for a date range. You can then go to your other calendar and Import the CSV file. This at least works for Google Calendar.
I use the Google Calendar Sync for my home Outlook, and I was going to install it at work, but I suspect it puts everything into the same calendar so I didn't try it because I want my work appointments in a separate calendar from my personal appointments.
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