Exchange 2010 & Outlook 2003 Offline Address Book (OAB)

Current Status: Issue with mitigation

If the client machine on which 2003 is installed has been configured to use a proxy server), you must enable "Bypass proxy server for local addresses" under Internet Options > Connections > LAN settings or add the CAS server or CAS arrays to the exception list shown in Figure 10.

Figure 10:
Proxy server settings in Internet Explorer

If a proxy server is used in the organization and you haven’t done one of the following:

  • Enabled “Bypass proxy server for local addresses”
  • Added the CAS server or CAS array to the “Exceptions list”

The Outlook 2003 clients will get an error when trying to download the offline address book (OAB). For more information about the error messages and the steps necessary to remediate the issue, see the following KB article:

This issue also affects Outlook 2007 and 2010 clients.

Outlook 2003 clients will also receive an error message when trying to download the OAB if the correct OAB hasn’t been specified for the database(s). For more information and steps required to remediate this issue, see the following KB article:

Special Thanks to Henrik Walther

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