The Exchange 2000 line includes three servers: Exchange 2000 Enterprise, Exchange 2000 Server and Exchange 2000 Conferencing Server. Each server will have its own licensing structure, but Exchange 2000 client access licenses (CAL) are good for access to all three.

Microsoft officials claim there will be only a small pricing change for existing Exchange customers, since more than half of them purchased Exchange CALs via an Enterprise Agreement, which allows free upgrades to Exchange 2000 CALs. Customers that are part of the Exchange or BackOffice CAL Upgrade Advantage program also will get a free CAL upgrade.

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