By default when you connect an Exchange mailbox to Outlook 2007 or Outlook 2010 the ‘Use Cached Exchange Mode’ option is enabled.
The Outlook cached mode feature was designed to reduce network traffic between the Outlook clients and the Exchange server.
It can take up to 24 hours before all clients have the new or updated accounts in their Address Book.
The following registry settings can be used to disable the Global Address List from being included in the cache.
They do for my colleague sitting next to me, so I don’t think it is a server misconfiguration or something like that.
Is there any way I can force a manual update of the Offline Address Book (OAB) in Outlook or reset it completely otherwise?
While it may be tempting to turn off updating, it defeats one purpose of the social connector: to keep your contacts updated.
The change log in the notes field displays the changed data, should it try to update the contact with old information. The key is the same for all versions of Outlook that support the Social Connector. HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Social Connector DWORD: Run Automatic GALSync Possible Values: 0 (Never Sync) 1 (Update without Prompt) 2 (Prompt to sync) Default setting is Update without Prompting.
In general, Outlook will automatically update the Offline Address Book (OAB) for Exchange accounts once every 24 hours.