This reduces network traffic and improves performance.If Outlook is left running constantly in Cached Exchange Mode, it updates the Offline Address Book automatically about once a day, depending on Address Book updates on the server running Exchange. At the moment we have an issue with the Global Address List.We have created some distribution groups in Active Directory containing some users but as time goes on the users change.If you go to Tools -- Download Address Book, does it successfully update?That will rule out a communications issue in receiving differential OAB updates. There's a lot of server-side info there that won't help you, but there are some client-side settings you can change to monitor & adjust Outlook's OAB-fetching behavior.
By default when you connect an Exchange mailbox to Outlook 2007 or Outlook 2010 the ‘Use Cached Exchange Mode’ option is enabled.But when I restore cached mode and restart outlook it's missing again. I tried deleting the This should be a server-level setting.Your Exchange admin should be able to configure the time interval between updates for your Offline address book downloads.It's possible that you're looking for the new users before your interval period has expired.To additionally complicate things, the OAB on the server is by default generated once per day, at midnight.After updates to the Exchange contacts, client reported not being able to see the updated version.