Exporting a PST in MS Outlook - progress bar looping

Exporting a PST in MS Outlook - progress bar looping

I'm exporting a PST file in MS Outlook on Windows XP. It's writing the .pst out to the correct location, and the progress bar is indicating how long left. However as soon as the progress bar gets to the end, it starts again from the beginning. Is this normal? If so, how many iterations can I expect before it finishes?