Updated: July 11, 2020 (March 24, 2003)
SidebarLimitations and Removed Features
Exchange 2003 makes few radical departures from the Exchange 2000 architecture and thus inherits most of its predecessors limits on the number of mailboxes or public folders each server can host. Furthermore, Microsoft removed some Exchange 2000 capabilities from Exchange 2003, planning to offer equivalent functionality through other products. These limitations could prevent effective server consolidation in some cases, and the removed features could present backward-compatibility problems in others.
Same Architecture Limitations as Exchange 2000
Unlike the radical changes planned for the next release of Exchange (code-named Kodiak), which will use the new Yukon storage technology, Exchange 2003 still relies on the venerable Extensible Storage Engine (ESE) database technology used by other products and Windows services, such as Active Directory, SharePoint Portal Server, and the Dynamic Host Configuration Protocol (DHCP) server service. It also still supports at most four storage groups, each which can contain up to five mailbox or public folder databases. This limit makes Exchange problematic for organizationsprimarily ASPsthat want to host many mail stores on an Exchange server and keep each customers data isolated from the others.
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