To migrate your events and information from Outlook Calendar to iCal, just follow these steps:
Open Outlook and go to "File" > "Import and Export" > "Export to a file."
Select "Comma Separated Values (Windows)."
Select the calendar you want to export, save it to your desired location, then click "Finished." (Note: When exporting more than one year's worth of data, we recommend that you divide your calendar into multiple, one-year segments and export each file separately; otherwise, you may encounter errors.)
Select the desired date range of events to export, then click "OK."
Open iCal and just "Import" the data
(** Only formats and filenames that end in .ics or vCal formats filenames that end in .vcs will work **)
