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Chapter 26. Using Outlook as an Exchange... > Understanding Cached Exchange Mode

Understanding Cached Exchange Mode

Outlook 2003 introduces a new concept in data storage and retrieval when using Exchange Server: Cached Exchange mode. If you've used previous versions of Outlook, you know that any loss in a high-quality connection to Exchange Server instantly resulted in Outlook displaying any number of annoying error messages before it stopped working completely. Outlook 2002 would display the ever-annoying Requesting Data from the Microsoft Exchange Server Computer dialog box for minutes while your computer practically ceased to function. When Outlook determined that the connection to the server was unavailable, it would display error messages such as Unable to Update Public Free/Busy Data, Operation Failed, or Unable to Complete Operation. Outlook then had to be shut down, usually by killing its process in Task Manager. Even if the network connection restored itself after the first error message, previous versions of Outlook were often unable to detect that the connection was suddenly available again and had to be restarted.


With Outlook 2003, Microsoft endeavored to enable people to “walk around with Outlook.” They recognized that with the increasing numbers of laptops, Tablet PCs, Pocket PCs, and smart phones, people would want to use Outlook as an Exchange client in many new ways.


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