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Differences between Exchange Server 5.5 and Exchange 2000

What are the differences between Exchange Server 5.5 and Exchange 2000?

Do you want the whole list, or just the top 100? Seriously, Exchange 2000 is a very different product.

The primary differences are...

-Exchange 2000 does not have its own directory or directory service; it uses Active Directory instead.
-Exchange 2000 uses native components of Windows 2000 (namely, IIS and its SMTP, NNTP, W3SVC and other components, Kerberos and others) for many core functions.
-SMTP is now a full peer to RPC, and is it the default transport protocol between Exchange 2000 servers.
-Exchange 2000 supports Active/Active clustering and was recently certified for Windows 2000 Datacenter.
-Exchange 2000 scales much higher.
-It boasts conferencing services and instant messaging.

There's way too many more to mention here. Check out https://products.office.com/en-US/exchange for more details.

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