A colleague of mine is having problems with Outlook and Google Calendar Sync. He got a new machine and set up Outlook 2007 on that machine. He also installed Google Calendar Sync. However, when he synced Outlook with Google Calendar, he got a number of duplicate entries in Outlook's calendar. We tried deleting all entries in the Outlook calendar and doing a 1-way sync from Google Calendar to Outlook, but the duplicated entries appeared again. We ultimately removed the duplicated entries manually, but we experienced problems pushing the changes back to Google Calendar, so we deleted the calendar in Google Calendar and tried to sync again (using a 1-way sync from Outlook to Google). Now Google Calendar Sync says that it is synchronizing, but no entries appear in the Google Calendar calendar. What could the problem be?