Outlook 2016 offline address book not updating cached mode
When I disable cached mode and restart outlook I see the new address fine.
Depending on the size of your organization and changes to default settings, it could take days before a new user can make its way into the OAB and onto your local copy.
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.
Summary: Learn about the two Exchange connectivity modes that you can use for Outlook 2013 deployments—Cached Exchange Mode and Online Mode.
Complete a brief survey to get a complimentary 70-page whitepaper featuring the best methods and solutions for your virtual environment, as well as hypervisor-specific management advice from Tech Target experts. When a new email address is added to our company's Exchange server it doesn't show up immediately on my Outlook, and I suspect that it's because of the "cached mode".