Hmm, seems as if the archive has gone blank.
One other thing you can try is import the messages into a new folder in your current profile:
[li]Create a new folder in Outlook and open this.
[/li][li]Go into File menu -> Import and Explort…
[/li][li]Select “Import from another program or file” and click ‘Next’.
[/li][li]Select “Personal Folder File (.pst)” and click ‘Next’.
[/li][li]Browse to the PST file and open it, select “Do not import duplicates” and click ‘Next’.
[/li][li]Select the folder containing the message you’re looking for (or Inbox if not sorted into folders).
[/li][li]Tick “Import items into the current folder” and click ‘Finish’.