Outlook Contact List Problems When Moving To Another Machine

This is probably not of interest to any of you.  I'm just posting it here because it's a problem I frequently face at work and I want to remember where the link is to solve it.  Here it is.

 

Basically, when I reformat a computer or move one of my users to a new computer, I migrate their Outlook .pst file that contains all their mail and contacts.  However, unless I follow the steps in this link, they cannot add addresses to emails from their Outlook contacts.