If your archive folders are currently not visible in your Microsoft Outlook 2003 folder list, on the Outlook menu bar go to File/Data File Management and the Data File Management window will open (see thumbnail below). Click the Add button on the Data File Management window and the New Outlook Data File window will open – if you are working in Outlook 2003, confirm that Office Outlook Personal Folders File (.pst) is selected in the list box (it should be by default) and then click the OK button (see thumbnail below).
The Create or Open Outlook Data File window will now open (see thumbnail below). Select the archive.pst file (or whatever file you want to access) and then click the OK button.
The Personal Folders window will now open. Click the OK button and then the Close button on the Outlook Data File window and you will see Archive Folders now in the Outlook folder list (see thumbnail below).