I was getting this error when doing a Send/Receive (F9) from Outlook 2007 calendar to Google Calendar. This is how I fixed it: The trick is to find an invalid year in the hundreds or thousands of lines in the Google Calendar .ics file. I went into Google Calendar settings and exported the zipped .ics file to my Desktop. Then I unzipped the file, did NOT open it, but changed the .ics extension to .txt, then double-clicked the file, which opened a text document in Notepad. I then used Wordpad's Edit > Find... feature and searched for " CREATED:0" which would signal an invalid year (because all of the " CREATED" entries should start with a valid year like " CREATED:2010......." ) I found one line that matched the search criteria, a recurring monthly meeting -- see 7th line down in the excerpt below. I then went back into Google Calendar and deleted this recurring meeting. I also deleted it in my Outlook 2007 calendar, and re-entered the information in Outlook, then presed the F9 key again. The " Outlook cannot parse the property 'CREATED' ..." error no longer appears.
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20110104T100000
DTEND;TZID=America/New_York:20110104T120000
RRULE:FREQ=MONTHLY;UNTIL 110405T140000Z;BYDAY=1TU
DTSTAMP:20101215T031617Z
UID:elot1725ug7v9l9lwmrst62gvo@google.com
CREATED:00001231T000000Z
DESCRIPTION:
LAST-MODIFIED:20101201T163900Z
LOCATION:Wilson Smith\, 21st Floor
SEQUENCE:4
STATUS:CONFIRMED
SUMMARY
epartment Meeting
TRANSP:OPAQUE
END:VEVENT