I recently got a new computer with Vista and since setting up my Blackberry Desktop Manager I am seeing that my Calendar data from yesterday backward is being deleted from my Outlook Calendar each time I synchronize the two. The old calendar data is remaining in my Blackberry calendar but has been removed from Outlook. This wasn't happening on my old XP computer.

I need that data restored to my Outlook Calendar. What is happening and how can I make sure this no longer happens?