Exchange 5.5 works great in a Windows 2000 environment. You can install and use Exchange 5.5 before or after your OS upgrade. In order to use Exchange 2000, you do need Active Directory, and your Exchange Servers themselves must run on Windows 2000 (preferably with SP2 installed). For more information on the requirements for Exchange 2000, visit https://products.office.com/en-US/exchange.
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