Exchange 2007. Cannot see the 'Mail User' icon under 'Recipient Configuration'

Exchange 2007 Std.  Cannot see the 'Mail User' icon under 'Recipient Configuration'
But I can see: 'Mailbox', 'Distribution Group', and 'Disconnected Mailbox'.

I have existing domain user accounts that I want to assign external email addresses to, and want to use the 'Mail User' feature to accomplish this.

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Matthew MillersCommented:
Mail user?

There should be...
Mailbox ; distribution group ; mail contact ; disconnected mailbox

if you just want to ammend the email address attrbiute, you can still do this via ADUC

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cliffordgormleyAuthor Commented:
Yep, I can see mailbox, distribution group, mail contact, and disconnected mailbox,  but i do not see Mail User.  I am looking at a book called: Microsoft Exchange Server 2007: A Beginner's Guide, by Nick Cavalancia.

A Mail User is supposed to be a user who has an AD account, but uses an external email address.
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