Therefore that must have been caused by something else. Do you wonder if your IT business is truly profitable or if you should raise your prices? "Huston we have a problem" :-) That suggests the server has a problem with the domain.
Learn how to calculate your overhead burden using our free interactive tool and use it to determine the right price for your IT services. "uncheck the use cache exchange mode in the account settings and try. It is either unable to query the domain properly or there is a replication issue.
However, be careful, don’t create too many lists, and furthermore, give thought to meaningful names for your lists.
The situation, you want to modify the GAL, however, you discover that you cannot edit (or delete) the Default Global Address List.
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.