* Access to public folders via Outlook Web Access, IMAP, or NNTP
* Active-active clustering
* Administrative groups
* CDO 1.2
* CDO for Workflow
* CDOEXM
* Coexistence with Exchange 5.5
* Connector and migration tools for GroupWise
* Exchange 5.5 Event Service
* Exchange Web forms
* Exchange WMI classes
* Installable File System (also known as IFS or M: )
* Outlook Mobile Access
* Outlook Web Access support for rule creation and editing
* Routing groups
* Transport event sinks
* Workflow Designer
* X.400