If you’re a Google Calendar user, you may have had issues adding events to your calendar when someone sends them to you attached to an email in iCal format (the files usually looks like “invite.ics”).

Can I Import an ICS file into Google Calendar? To import a .ics or iCalender file to your Google Calendar, open Google Calendar Settings and navigate to Import & export tab. Next, select the .ics file ...

I have an Outlook Calendar that lives on my employer's network. The only way I've been accessing it from my OS X personal machine is through a web browser and logging into the webmail exchange server ...

iCal can show a Birthdays calendar. Google Apps has one (maybe left over from Snow Leopard? I don't know) too, and I want to sync them. Right now iCal knows more birthdays than Google does.