Yup, 5.0 will not work on 2000 (or at least MS says it won't work, and I would listen to them...) 5.5 SP4 is the oldest version MS supports on 2000, but since you would have to purchase a new version ...
Microsoft on Thursday cleared up the mystery surrounding its next Exchange Server release plans, as described in an "Exchange Server Roadmap Update" announcement. Like SharePoint Server and Project ...
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