Outlook 2016 address book not updating

Key: All Users or any other object type such as All Contacts, All Groups or All Rooms.

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When you have Cached Exchange Mode enabled, Outlook by will by default cache the main Global Address List as well.

In this guide, the relevant timings are explained and instructions are given in how you can directly force an update and resync, which can be very handy when troubleshooting or when you work in an Exchange environment which sees a lot of user mailbox mutations.

This means that in the worst possible scenario, an update to the Address Book won’t become available to the user until 48 hours after the change.

In that case the whole OAB is being downloaded again.

In a later section, it is explained how to modify this.

This situation however is extremely rare since the default maintenance time on Exchange is at AM and updates and downloads are usually performed during working hours.

Even though Outlook is the last in the chain, it is often the first level where the troubleshooting takes place as usually this is where the request is coming from.

This is called the Offline Address Book and is being generated on the Exchange server.

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