I created the new OAB and ran the commands you suggested without error, but when I open outlook it still hangs when I try to download a copy of the offline address book.When you have Cached Exchange Mode enabled, Outlook by will by default cache the main Global Address List as well.

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In that case the whole OAB is being downloaded again.

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

The database homing the System mailbox should be active and mounted.

Clients will contact the mailbox server on which the OAB files are and downloads directly using Auto Discover.

If the key name doesn’t exist, Outlook uses a value of 8.

Prompt before for full download As the OAB can be quite large in some environments, it could be wise to be prompted when Outlook wants to download the full OAB.In Exchange 2013, OAB is processed by mailbox server role which owns the copy of the database of the Arbitration system mailbox with OAB Persisted Capabilities.OAB resides on the mailbox server in the folder “C:\Program Files\Microsoft\Exchange Server\V15\Client Access\OAB”.Key: All Users or any other object type such as All Contacts, All Groups or All Rooms.Full OAB download threshold To modify the threshold at which Outlook will download the full OAB rather than the incremental update, you can set the following Registry value Key: As the value, set at which relative size a full OAB download should take place rather than an incremental update.Is there something I am missing in the configuration of Outlook 2016 when connectiing to Exchange 2010 in cached mode?