I'm using an 8300 with PocketMac and syncing Entourage. Here's my issue:

When I sync, Pocketmac is deleting every calendar item that is older than 2 months.... I'm sure its a simple solution, but I cant find it!

Many thanks in advance

On your BlackBerry, go to the Calendar, then press the Menu button, and select Options. Do you have a settings that says "Keep Appointments" set for a specified time.

If yes, you will need to change that to forever.