Your Outlook Global Address Book is now up-to-date. Outlook 2011 and 2016. Outlook 2011 does not use Exchange Cached mode and directly connects to the Global Address Book (GAL) via LDAP connection. In this case your global address book will update each time Send/Receive is pressed. It contains all the email address and contact information of an individual profile for Outlook. Sometimes, users have faced an issue like “Outlook Offline Address Book not updating” because of resources available on the host server and service failed. To fix Exchange Outlook OAB not updating issue, So that user able to opt a manual method. We are currently using exchange 2013 and most users have outlook 2010, there are a few users that have outlook 2013. When we make a change in AD or Exchange the outlook 2010 global address books update immediately and automatically, but the outlook 2013 users do not. Updating the Offline Address Book in Exchange and Outlook When you have Cached Exchange Mode enabled, Outlook by will by default cache the main Global Address List as well. This is called the Offline Address Book and is being generated on the Exchange server. Updating your address book synchronizes the cached Address Book with the Global address book, and may fix instances of mail that is bounced back to the sender. Note: In order for some GAL entries to show up properly you may need to turn off Cached Exchange Mode. For some reason, machines in Cached Mode are not receiving updates of the global address book. An email account created 10 days ago is still not appearing in the address list of cached mode machines. If I remove the client from Cached Mode it immediately sees the new addresses. In general, Outlook will automatically update the Offline Address Book (OAB) for Exchange accounts once every 24 hours. When it didn’t or when you want to make sure you do have the latest OAB available, you could manually trigger an update from within Outlook as well. How to troubleshoot the Outlook Offline Address Book in an Office 365 environment. Content provided by Microsoft. Applies to: Exchange Online. Select Product Version. If the expected changes aren't present in the GAL, the changes will not be replicated to the Offline Address Book. Manually Download Address Book in Outlook 2016 Force Update Offline Address Book on the Exchange server. The new user does appear in Outlook Web Access and does appear in "All Users" in Address Book BUT not in GAL. Administering the offline address book in Outlook. Content provided by Microsoft.. This can cause the “Updating Address Book” status appearing for a long time. Outlook is helping you complete other activities and does not allow the address book update to interfere.