Outlook 2016 address book not updating
To view address books other than the default, in Mail, on the Home tab, in the Find group, click Address Book.Then in the Address Book box, click the address list that you want to view.
If this is happening, then you may notice missing, non-existent and/or incorrect entries.Synchronizing your Outlook (cached) address book with the Global Address book may fix these discrepancies.Instances of mail that is bounced back to the sender may also be fixed.Please use the steps below to update your Global Address Book.In order for some GAL entries to show up properly you may need to turn off Cached Exchange Mode.You can use the Address Book in Microsoft Outlook 2010 to look up and select names, e-mail addresses, and distribution lists when you address e-mail messages.
The Outlook Address Book is a collection of address books or address lists, created from your Outlook contact folders.
If you use Outlook with a Microsoft Exchange Server account, your Address Book list will include the Global Address List (GAL).
The GAL contains the names and e-mail addresses of everyone that has an account with that Exchange Server and is configured automatically by Exchange.
Please visit the document on How to turn on or off Cached Exchange Mode for (Outlook 2007, Outlook 2010, and Outlook 2013).
Outlook 2011 does not use Exchange Cached mode and directly connects to the Global Address Book (GAL) via LDAP connection.
In this case your global address book will update each time Send/Receive is pressed.