Gal not updating in cached mode exchange 2016
It can take up to 24 hours before all clients have the new or updated accounts in their Address Book.
To resolve this you can disable Outlook cache mode, however this will remove the benefits it provides.
If you want to turn off Cached Exchange Mode, repeat the steps, but clear Use Cached Exchange Mode.
By default, 12 months of your email is available offline, but you can control how much mail is kept offline.
The staff member may notice that when the address book is viewed in Outlook their name remains unchanged, and may do so for 24-48 hours.
A common reason for this is the offline address book (OAB) schedules that are in place for the environment.
Another option is to only disable the Global Address List from being included, so it will also be a live copy from the exchange server.
The following registry settings can be used to disable the Global Address List from being included in the cache.
If you're having issues with your Outlook address book, such as a new employee's information not showing up, there may be a simple solution.
It may be that the information from the Exchange server has not yet flowed to your local Outlook program.
So to force your Outlook to sync with the Exchange server you can manually update the GAL.
In this mode, a copy of your mailbox is saved on your computer.
This copy provides quick access to your data, and it is frequently updated with the server that runs Microsoft Exchange.