Points of My Scenario:
1. I use Outlook 2010
2. I archive emails to PST files
3. When I have searched for emails, Outlook 2010 returns results from both Inbox and Archive folders (PST's)
4. Now, Outlook 2010 searches have stopped returning results from my Archive folders
QUESTION: How can I re-enable Outlook 2010's ability to return results from Archive folders?