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Help! I have lost a whole folder of Outlook Contacts!?

I was backing up my Outlook Personal Folders last night and accidently opened up MS Outlook whilst the back-up was in progress. Now when I open up Outlook and look for my Contacts one of the sub-folders of contacts is gone. Instead there is a grey pane with the following message:

"Unable to display the folder. Errors have been detected in the file C:\DocumentsandSettings\User\LocalSettings\Application Data\Microsoft\Outlook\outlook.pst. Quit all mail-enabled applications, and then use the Inbox Repair Tool."

I have followed these instructions but even after using the Inbox Repair Tool (which end with a confirmation message that the Inbox has been repaired) the subfolder is not displayed.

Please help I need these contacts urgently!!

oops