Another way to make sure that you get a fresh copy of the OAB is by renaming the oab-files to when Outlook is closed.

They are stored in the following location: which itself holds subfolders with named after Account GUIDs.

Rather than waiting 24 hours for Outlook to update the Offline Address Book on its own, you can force an update via the Send/Receive menu button.

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In general, Outlook will automatically update the Offline Address Book (OAB) for Exchange accounts once every 24 hours.

When it didn’t or when you want to make sure you do have the latest OAB available, you could manually trigger an update from within Outlook as well.

I might have a problem with my Offline Address Book in Outlook.

For me, new colleagues are not showing up and the contact pictures aren’t displaying either.

In Outlook 2010 and previous, it is recommended to leave the option “Full Details” enabled.

In Outlook 2013 and Outlook 2016, you’ll find that this option is no longer available as full details are also used to build the Contact Card.

In that case, it is recommended to recreate your mail profile.

Note for Mac Users: Mac versions of Outlook do not connect to the Exchange server in the same way as PC versions.

My computer slows down when Outlook shows the "Updating Address Book" status. In computers with slow hard disk drives, such as portable computers, or running Outlook in a Virtual machine, the process of updating the address book can slow down the computer if the hard disk is fragmented.

To improve offline address book download performance, try defragmenting your hard disk.

They do for my colleague sitting next to me, so I don’t think it is a server misconfiguration or something like that.