Outlook must be able to access the server to obtain this information. The offline address book does not contain the following items that are available in the global address list:Ĭustom properties in Active Directory that an administrator has added (for example, the Employee ID of each employee) Therefore, some information is available in the global address list that is not available in the offline address book. Q3: Does the offline address book function exactly like the global address list?Ī3: The offline address book is a snapshot of the Active Directory directory service information that is available in the global address list. Instead, Outlook easily obtains this information from the local offline address book. With an offline address book, Outlook does not have to connect to the global catalog to resolve names, nor does it have to open a person’s details record. Q2: Why does cached mode generate an offline address book?Ī2: The offline address book contains a set of all the properties of a user (such as e-mail addresses and names) that Outlook requires.

Therefore, network communication between Outlook and Exchange is significantly reduced. oab files on your hard disk instead of communicating directly with your server or servers. ost file), and the offline address list from your Exchange computer is synchronized to a collection of files (.oab files) on your client computer. When you are running in cached mode, your Exchange mailbox is synchronized to a local file (an. It provides an experience that is similar to the offline configuration in earlier versions of Outlook. More Information General informationĪ1: Cached mode is the new default configuration for Outlook. To make it easy for you to find the information that you want, this article is organized in categories in a question-and-answer format.

Because cached mode generates an offline address book, it's important that you understand how to configure the offline address book so that it works efficiently in your Microsoft Exchange organization. By default, Outlook uses a cached mode configuration. Microsoft Outlook has many new features and enhancements that are related to the offline address book. Outlook 2016 Outlook 2013 Microsoft Outlook 2010 Outlook for Office 365 Outlook 2019 More.

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