The Exchange 2007 edge transport role contains:

Anti spam protection
Anti virus protection
When used email hits the edge transport before going to the hub transport server
Can not exist on a server with any other server role.  (IE: a Hub Transport and Edge Transport server can not exist on the same physical machine)
Installed on the edge of your [...]

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The Exchange 2007 mailbox role provides and uses the following:

Holds Exchange databases
Hold mailboxes and public folders
Part of an Active Directory Domain
Requires plenty of space in Active Directory
Allows a maximum of 50 mail storage groups (in Exchange 2007 enterprise)
Allows maximum of 50 mail databases across all storage groups (in Exchange 2007 enterprise)

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If you migrated from Exchange 2003 to Exchange 2007 and still have some residual mailboxes left behind on the old exchange 2003 server, this Power Shell cmdlet will be very useful to you.  It will list all users the old exchange 2003 server and their respective mailstores.
Get-Mailbox -OrganizationalUnit OUNAME -Server OLDSERVER | Format-List Alias, ServerLegacyDN
Where [...]

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Here is a simple command that will retrieve the first name, last name, and email addresses from Active Directory.
dsquery user -name * -limit 500 | dsget user -fn -ln -email >
emails.txt

-limit command
You can change the “-limit 500″ value to whatever you would like the query limited to. IE: If you would only [...]

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