Global address list not updating in exchange
Please visit the document on How to turn on or off Cached Exchange Mode for (Outlook 2010, and Outlook 20).
Outlook 2011 does not use Exchange Cached mode and directly connects to the Global Address Book (GAL) via LDAP connection.
When changes occur within the main Global Address Book (GAL) on the Office 365, computers running Outlook 20/2016 may not automatically receive the updates.
So I am unable to use the old GUI of Exchange 2007.To solve this issue, you need to do the following steps.Start Adsi Edt (be careful with this change) Go to default Naming Context Microsoft Exchange System objects Open the properties of the objects which gave the warning in the Power Shell message.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.
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.