Manually update the GAL (Global Address List)

What the problem is:

The Global Address List is not automatically updating when by default it is supposed to.

What is causing said problem:

The error causing the Global Address List to not update is a corrupt file within Outlook. This can happen after a long period of use with outlook and happens for no apparent reason.

How to Manually Update the Global Address List:

• Go to Exchange System Manager and
• Navigate to Recipients -> Offline Address Books.
• In the right pane, right-click the default address book and click Rebuild.