You have an Exchange Server 2010 Service Pack 1 (SP1) organization.
The organization contains two mailbox-enabled users named User1 and User2.
You need to ensure that User1 can send email messages as User2.
Which cmdlet should you use?

A.
Add-ADPermission

B.
Set-Group

C.
Set-MailboxFolderPermissions

D.
Set-Mailbox

E.
New-ManagementRoleAssignment

F.
New-ManagementScope

G.
New-TransportRule

H.
New-MailContact

I.
Set-MailUser

J.
Set-ManagementRoleAssignment

Explanation:
Add-ADPermission e.g. Add-ADPermission user2 -User “Domain\User1” -Extendedrights
“Send As”

http://technet.microsoft.com/en-us/library/bb124403.aspx
http://technet.microsoft.com/en-us/library/bb676368.aspx