viewing other users' mailboxes in Google Apps (email delegation)

I often find that I want to enable users to see other user's mailboxes within their Outlook. If there's a common mailbox like careers@domain.com or you're viewing the mailbox temporarily of an employee who has left the organization.

On Google Apps, I have found the method for doing that described here:

http://googleappsupdates.blogspot.com/2009/08/mail-delegation-in-gmail.html

Of note - as of December 2010, this is available in premier edition only and not available in the education edition.