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Exchange Server 2003
Exchange Server 2003 will run on both Windows 2000 and Windows Server 2003, but you'll get greater benefits with Windows Server 2003. When you combine the two servers you get features such as improved memory allocation, reduced Active Directory (AD) replication traffic, Volume Shadow Copy service, and cross-forest Kerberos authentication. Overall, Exchange Server 2003 offers a range of enhancements and improvements for end users (information workers), IT managers, and developers—here's a rundown.
Outlook 2003, which is being released along with Exchange Server 2003 and Office 2003, offers many performance enhancements that work in conjunction with Exchange Server 2003. It accomplishes this though two specific features: cached mode and synchronization improvements. Cached mode creates a locally stored data file (the cache) that Outlook uses for all foreground activity. It accesses the Exchange server in the background, so any delays won't affect the user. The data compression that Exchange Server 2003 performs on the server also helps client performance by reducing the traffic between Outlook 2003 and Exchange Server. In addition, Exchange optimizes the client/server communication by reducing the total number of requests by getting more information with each request—this is known as being "chunky" instead of "chatty."
The combination of cached mode and the synchronization and optimization improvements enhance the end user experience for remote users on Outlook significantly. Dialog boxes that display requests for information from an Exchange server will no longer appear on a user's Outlook client, because users will work primarily from their local Exchange mailbox data files. More important, should Outlook lose connectivity between the Outlook client and the network, it operates without interruption. In theory, these features should also result in fewer requests from the Exchange servers in total, reducing the overall load on your Exchange servers.
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