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By using the Offline Address Book, Outlook does not have to connect to Exchange in order to resolve names or open the records for each user.
This reduces network traffic and improves performance.
If Outlook is left running constantly in Cached Exchange Mode, it updates the Offline Address Book automatically about once a day, depending on Address Book updates on the server running Exchange.
You can use the Outlook Address Book—a collection of address books or address lists created from your contact folders—to look up and select names, email addresses, and distribution lists when you address email messages.
When you open the address book for the first time, the default address book is displayed.