Dear EE Well, the title kinda says it all. I got a hybrid setup with Exchange 2010 and Office 365. If I create a distribution group on premise it does sync to Office 365 and is available in the global address list but for some reason, the offline address book is not updating. Microsoft Outlook has many new features and enhancements that are related to the offline address book. By default, Outlook uses a cached mode configuration. 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. I have two Exchange 2016 servers and a single domain controller. 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. Are you troubleshooting an Offline Address Book issue? Knowing how the timings work in Outlook and Exchange and how to trigger a manual update and download of the OAB-files can help you solve it more quickly. Also, when a lot of user mutations take place, increasing the OAB update frequency makes sure that the OAB on the Outlook clients are quicker up-to-date. If you would like to read the other parts of this article series please go to. The Offline Address Book (Part 1) The Offline Address Book (Part 2) I noticed that a new email address was not showing up in the global address list in Outlook 2010 for a few executives. Some initial investigation resulted in pointing the finger at the offline address book. We had the same issue with Exchange 2007 and Exchange 2013. Our GAL and OAB were healthy and updating for Outlook clients in cached mode BUT numerous other address lists such as those we created for each location and division were not updating. While you may have sorted your Contacts folder the way you want it to, the Address Book in Outlook has its own sorting mechanism. The separation can be quite confusing some times and the options which control the sorting order aren’t all located in the same location either, which can make things even more confusing. Hi Michael, Sorry for a late response, I did not see that your comment was pending approval. The idea behind the offline address book is that a rich client, like Microsoft Outlook 2013 for example, could download it and allow the user to compose/address emails while working offline.