Delete all the files with the extention .OAB, Before doing this, make sure outlook is closed. Re open outlook, outlook will download fresh copy of Offline Address Book from Server. Inform if you are facing issue again.. Updating address book. Connected to Microsoft Exchange. When I restart Outlook or reboot, the "Updating address book" goes away for a few minutes, but then it comes back. Apparently, the address book is stuck updating. I have tried manually downloading the address book, but it does not work. Any help is appreciated. Thanks! Hi, We are having delay in Inbound Emails and Constantly "Updating Address Book" appear for outlook 2016/2013/2010. Please assist. I can send Test Email AutoConfiguration by Private-Message. Updating the Global Address Book in Outlook on Windows. The Global Address Book (GAL) is a directory of available contact information for CUMC, NYPH and Columbia University faculty, staff and students. It can be accessed when using a CUMC email account with Outlook and Web Outlook. 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. Please use the steps below to update your Global Address Book. In order for some GAL entries to show up properly, you may need to turn off Cached Exchange Mode. Please visit the document on How to turn on or off Cached Exchange Mode for ( Outlook 2010 , and Outlook 2013 and 2016 ). 7.1 Understanding Address Book Update and Purge Programs. Periodically, you might need to update or purge address book information. To update individual address book information, use the Address Book Revisions program (P01012). The other thing is that at the bottom of Outlook it's always like this "ALL FOLDERS ARE UP TO DATE, UPDATING ADDRESS BOOK. CONNECTED TO: MICROSOFT EXCHANGE" and this is for all users that have been migrated to Exchange 2013. 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. Something during the setup must have messed something up and now i can't download the address book from outlook .IT gets stuck saying "updating address book" I know that in exchange 2010 you could see the address book settings in the EMC but I can't find it anywhere.