MS Exchange Server 2003 Question:

Exchange 2000 SP2 introduced the concept of OWA segmentation. This is where you can selectively enable/disable certain features in the web client. Exchange 2003 extends the segmentation options found in Exchange 2000. You can either set global (per server) segmentation via a registry parameter, or set the msExchMailboxFolderSet attribute on user objects. A bit mask determines the functionality available to the user.