Blackberry sync deleting old calendar items from Outlook 2007

I have a client that wants to keep 2 months of calendar events on his blackberry. That has been set somewhere and does occur. The problem that he's having is that upon sync'ing with Outlook Blackberry desktop manager wants to delete the calendar events from Outlook 2007's calendar when he syncs. This is a problem for him because he likes to retain old calendar information in Outlook in case he has to review past events..

The Blackberry Desktop manager is v4.5
Outlook is 2007 and his profile is IMAP
He is a BIS user, not Blackberry enterprise
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