Microsoft KB Archive/823580

= How to configure how the Offline Address Book is downloaded when you use Outlook in Cached Exchange Mode =

Article ID: 823580

Article Last Modified on 1/24/2007

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APPLIES TO


 * Microsoft Office Outlook 2003
 * Microsoft Office Outlook 2003 with Business Contact Manager
 * Microsoft Office Outlook 2007
 * Microsoft Office Outlook 2007 with Business Contact Manager

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Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SUMMARY
This article describes how to configure how the Offline Address Book is downloaded when you use Microsoft Office Outlook 2007 or Microsoft Office Outlook 2003 in Cached Exchange Mode.



MORE INFORMATION
To configure how the Offline Address Book is downloaded when you use Outlook in Cached Exchange Mode, follow these steps to configure the DownloadOAB value in the Registry.

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.  Click Start, and then click Run. In the Open box, type regedit, and then click OK. Locate and then click to select the following key:

Outlook 2003

HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook

Outlook 2007

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook

 On the Edit menu, point to New, and then click Key. Type Cached Mode . On the Edit menu, point to New, and then click DWORD Value. Type DownloadOAB, and then click OK.</li> In the right pane, right-click DownloadOAB, and then click Modify.</li> In the Edit DWORD Value dialog box, type the value that you want, and then click OK.</li> On the Registry menu, click Exit.</li></ol>

You can set the DownloadOAB value to any one of the following values, depending on your situation:
 * 0 = The Offline Address Book does not download automatically.
 * 1 = The Offline Address Book uses the Download Full Items download mode. This is the default setting.
 * 2 = Download the Offline Address Book in any download mode, but download a differential update in the Header only download mode.
 * 3 = Always download the Offline Address Book and a differential update in one of the following download modes:
 * Download Headers and then Full Items
 * Download Full Items
 * Download Headers

Note If Offline Address Book (.oab) files were previously downloaded and associated with a MAPI profile for Microsoft Outlook, this setting will not have the correct effect. To use this setting, you must set the registry value, remove any .oab files from the local computer, and then synchronize.

When you set this registry value to 0 (zero), cached-mode Outlook is forced to perform directory lookups against an Active Directory directory service global catalog server. This action increases the timeliness of access to modified or new Active Directory objects. However, this action also negates some of the increased tolerance for network latencies and outages.

Additional query words: OL2003 OL2007

Keywords: kbdownload kbconfig kbinfo KB823580

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