We have a sister company on our MPLS network but they are not on our domain. Would it be possible to give their computers (different versions of Outlook) access to the Addressbook? They are currently using POP3 to get their mail. I was just trying to provide them access to the addressbook. Can anyone tell me if it is possible and what steps to take to make it happen. Currently running Exchange 2010 server on Windows 2008r2.