I thought I found a fix. I used the Import function, directed it to the backup copy I have of the primary pst. Told it to import Suggested Contacts from there, into the same folder. It took about 60 seconds, had some kind of progress indicator that moved along, and while it was doing this it showed Suggested Contacts in the folder list. But when it completed, Suggested Contacts disappeared from the folder list. As a test, I sent an email out to see if it would create the Suggested Contacts in the folder list, but it is still not showing. But if I create another email to that same address, it does autocomplete the address, so perhaps the Suggested Contacts are, but are not showing up?