Works fine for me, Entourage 08, Leopard and 8100. Of course I started with a clean Sync Services and an overwrite sync, by following/modifying these steps at:
Sync Services and Spotlight FAQs
How do I reset sync services and start fresh? (Warning this erases data!!!)
1. Turn OFF all sync services in Entourage preferences
2. Quit ALL Office applications (including Daemon)
3. Quit Safari, Address Book & iCal and all applications synching through .Mac (Transmit, Yojimbo...)
4. Use Activity Monitor to quit Sync Services
5. Delete the contents of ~/Library/Application Support/Sync Services/
6. Optionally: if you want to replace all data in the system Address book and iCal with Entourage data, delete all iCal & Address Book Data Files:
~/Application Support/iCal/*
~/Calendars/*
~/Application Support/AddressBook/*
~/Library/Caches/com.apple.iCal/*
~/Library/Caches/com.apple.AddressBook/*
7. Reboot the Mac.
8. Restart all applications that sync to .Mac (Safari, Address Book, iCal, etc.... and Entourage).
9. Turn ON Sync Services in Entourage preferences.
10. Have Entourage replace all Sync Services items.
Set Missing Sync to overwrite the BlackBerry on the next sync only.
After the overwrite, normal syncing works fine.