To manually update the Global Address List (GAL) in Outlook, follow these steps:
1. Open Outlook and click on **File**.
2. Select **Account Settings**.
3. Click on **Download Address Book**.
4. Uncheck the option **Download changes since last Send/Receive**.
5. Choose **Offline Global Address List** from the drop-down menu.
6. Click **OK**.
7. Restart Outlook.
Although the GAL typically updates automatically, it may sometimes fall out of sync, leading to missing or incorrect entries.
You can also access the GAL through the Outlook Desktop Client by opening the Address Book or using the shortcut **Ctrl + Shift + B**.