I upgraded from Outlook 2007 to 2010 a few months ago and my cached addresses were imported and was working fine until this morning. Now when I start typing a name, it doesn't autocomplete it. I tired to re-import them in with the outlook.exe /importnk2 but it says that switch is invalid. In the suggested contacts in outlook, I see the 900 or so cached addresses...It just seems like Outlook is not looking there when I'm typing in an address for a new email. Tried to repair install of Office 2010 but didn't fix the issue.