How to access multiple mailboxes from one account in MS Exchange Server 2010 - video tutorial

There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator wants to confirm the message is delivered to all of mailboxes correctly. The video below explains how to grant full access rights to the selected mailbox for the specific user (John in this case). The video also shows how these mailboxes are visible in the left pane of MS Outlook right after the program is launched, while in OWA the user needs to switch between them manually.