I have catalogs that were created in the "C:\Users\Valued Customer\Documents\Adobe\Lightroom Catalog\Drill Team" directory using Version 2.0. I upgraded to 3.0 and have my catalogs on a separte drive. I don't want to remove the lightroom 2 catalogs as I don't know if I still want them but would like to get rid to the previews taking up space on my main drive. Can I just delete the "Drill Team Previews.lrdata" directory and sub directories 0-F? If I want to use the catalog later, can I have LR3 convert it and create previews if needed? Don't remember what I did when I upgrade to LR3 I think I only converted the main catalog with most of my photos.