There is no limit to the number of Exchange 2000 servers you can have in a single Windows domain; however, you will not be able to use a second server in that manner. Recovery for Exchange 2000 typically requires an alternate forest and recovery server. These are systems that have the same AD names and Exchange server name as your production systems, but they are not on your production network. See this article for more information on Exchange Disaster Recovery.
Dig Deeper on Legacy Exchange Server versions
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