16 nodes
Windows Enterprise edition can support upto 8 cluster Node.
Windows 2003 Standard Edition windows 2003 Enterprise Edition Windows 2003 Data Center Edition windows 2003 Web Edition
windows 2000 Professional windows 2000 sever windows 2000 standard edition windows 2000 home edition
Note: Yes, standard edition will work with enterprise edition.
Standard edition, Enterprise edition, Web edition, Datacentre edition and Web edition.
32 nodes
Windows 2000 will not be supported by Microsoft after next year, so you need to start moving off it. You can use either version of Exchange on Windows 2000 with SP3 or later. If you are going to cluster it then both Windows and Exchange need to be Enterprise Edition. Also Exchange Enterprise Edition supports more databases and greater storage limits than Standard Edition. Answer:You can use exchange server 2003 with windows server 2000. or you can upgrade windows server 2003 and use exchange server.
DataCenter
Standard Edition
Windows 95, Windows NT 4, Windows 98 (Standard and Second Edition).
Minimum ram standard edition 128 mb enterprise edition 128 mb datacentre edition 512 mb web edition 128 mb
The Microsoft Windows Small Business Server 2003 Standard Edition software is available to purchase online directly from Microsoft and also from Amazon.