Which Windows PowerShell cmdlet should you use?

Your network contains an Active Directory domain named contoso.com. You have an Exchange Server 2010 Service Pack 1 (SP1) organization. External users access their email by using Outlook Web App.

You need to ensure that the external users can log on to Outlook Web App without specifying a domain name.

Which Windows PowerShell cmdlet should you use?

A.
Set-OrganizationConfig.

B.
Set-OwaVirtualDirectory.

C.
New-OrganizationRelationShip.

D.
New-OwaMailboxPolicy.

Explanation:
Set-OWAVirtualDirectory -Identity “owa (default web site)” -LogonFormat username -DefaultDomain www.contoso.com

Reference:

http://technet.microsoft.com/en-us/library/bb123515.aspx