Netfolders and Windows 2000

I just replaced an older computer running Windows 98SE, Office 2000 and Outlook 2000. This user was subscribed to a shared calendar through my Exchange 5.5 Server. The replacement computer is a Windows 2000 Pro machine, still using Office 2000 andOutlook 2000. However, the new setup receives, but will not process Netfolder updates from that calendar. I have checked all settings in Outlook and Exchange Server. I can find no obvious solutions. HELP!! PLEASE!!