If you receive an error message then you can investigate further (Note: Set your Outlook client to send you a delivery report on the test email as well).
Then check the mailbox Exists (See Check for existence of mailbox sections below).1. The Mailbox SHOULD be in the right hand window (Providing you are in the correct administrative group, on the correct server, and in the correct mailbox store! Remember with Exchange 2007 / 2010 you create the mailbox with the Exchange system Manager anyway! On the Exchange Server, Start Ensure "Hide From Exchange Address Lists" is NOT ticked.
None of these were the fix for my issue and I’ll explain my resolution in detail later in this article.
Step 3: The new version of the GAL will now be downloaded.