Hi HenTech,
I would like to ask which way you used to set up your users on Outlook 2013, automatically setup, manually setup or IMAP/POP.
If the users are set up automatically, they can follow the steps below to find these lists.
1. Open Outlook.
2. Click Address Book on the right side of the bar.
3. Please click on Global Address List referring to the picture below and you will find these lists.
Thanks,
Yang Yu