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clients using Cached Exchange Mode perform most e-mail-related tasks from the local client, reducing the number of requests to the server for data and improving performance for items stored in the local copy of the mailbox. After the full copy of a user mailbox and offline address book is downloaded, Cached Exchange Mode significantly reduces network bandwidth consumption for e-mail between the client and server. This greatly improves the Outlook experience for remote or branch office users as well as removes the need to restart Outlook to an offline profile when network interruptions occur. While Cached Exchange Mode works with previous versions of Exchange, additional improvements in compression and performance between Outlook and Exchange make the user experience even better. Junk mail filtering does need Cached Exchange Mode enabled. However, you may still use multiple address books when turning on Cached Exchange mode. Personally, I do like this new feature in Outlook because I can focus on my work when losing the connection to Exchange.
