Exchange 2007 - Users showing in GAL but have no email acount

[Kyle]

We have Exchange 2007 installed. We don't use the Management console for adding users and still ised AD U&C. We dont give everyone an email address, such as a supply teacher or EWO visitor.We add then to AD so they can log onand do registers etc but nothing more. I have noticed that these users appear in the Global Address list even though the do not have any mailbox or mail attributes. I have double checked this in the Exchange Mgmt Console and they are not listed as having mailboxes?

 

Is this normally or am i doing something wrong.???