I have recently bought a new computer and connected it to a USB hard drive which contained all my photos and a copy of an Adobe Photoshop Elements (APE) 4 catalog which permitted me to run APE 4 directly from the USB drive. The new computer runs on Windows 7 with Adobe Photoshop Elements 7. When I attempted to open the old catalog, created in APE 4 APE 4, APE 7 needed to convert it. The converted catalog then needed to reconnect with files and this took hours because APE seems to be incapable of sorting this out automatically. On the other hand Picasa 3 dealt with the matter in minutes and Canon Zoom Browser dealt with it in seconds. Why is this? What are the advantages of using APE 7 over Picasa 3 or Canon Zoom Browser?