Thank you for your reply, it's much appreciated.
I do have some experience with this conversion as I did it for my production system some time ago.
This is for file cabinets that were acquired as the result of a merger. The former company never upgraded. I managed to update to 5.1b now, but I no longer have my copies of 5.1b sp3 and 5.1c. Would it be possible to provide a link?