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What's the main differences between Exchange 5.5 and Exchange 2000/2003?

Posted on 2009-05-17
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What's the main differences between Exchange 5.5 and Exchange 2000/2003?
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Question by:madhurikv
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Exchange 5.5 does not integrate with the NT4 domain or the Windows 2000/2003 Active Directory in a meaningful way. A single user could be associated with several different mailboxes. Exchange 2000/2003/2007 integrates tightly with Active Directory, and there is a 1:1 relationship between mailboxes and AD user accounts. There are other differences, depending on whether you have
a standard or enterprise version as it relates to maximum database size, but the directory integration is probably the biggest difference.
ALSO

-Exchange 2000/2003 does not have its own directory or directory service; it uses Active Directory instead.
-Exchange 2000/2003 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 2000/2003 servers.
-Exchange 2000/2003 supports Active/Active clustering and was recently certified for Windows 2000 Datacenter/2003.
-Exchange 2000/2003 scales much higher.
-It boasts conferencing services and instant messaging.

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