Method 2: Exchange Management CONSOLE Here below is an alternative to Power Shell.
Before you 'Apply' your Global Address List you may like to click on Edit, the benefit is that you can check, and if necessary, edit the settings.
As a learning progression, by all means start with GUI Exchange Management Console, but note as each Wizard completes so it shows you the corresponding Power Shell commands.
Why not save these so that in future you can use the cmdlets in the Shell?
Using cmdlets like those below will save you time, more so when you realize that every Exchange 2007 configuration task has a faster command-line equivalent.