I am in the final phases of preparing to move all of my archival Aperture Libraries over to Lightroom. Situation 1. I have been using LR CC and PS CC since last fall and am reasonably comfortable with it. 2. I have about 200,000 images stored in yearly Aperture libraries (about 10 different Aperture Libraries) 3. I have cleaned up those Aperture libraries making sure all of the images are referenced, there are no missing images and I have deleted the old previews and rebuilt the preview to large JPEG files I would like to have all these images in one catalog or library Question 1: At this point I have a choice in the process. Should I build one large Aperture library combining all the years first and then import that combined library into Lightroom or should I import the individual Aperture libraries into Lightroom and then combine the LR catalogues into one large catalogue. Does anyone have a similar experience, and if yes, what were the issues? With Lightroom import of Aperture Libraries, the LR catalog seems to ignore the folder structure leading to the folder containing the pictures and only uses the final containing folder name. One can fix this issue by adding folders and subfolders in LR after import to provide a bit of structure to the folder list. As long this additional structure is done on the same drive as the Aperture Library points to, Aperture seems to be able to find those pictures with problems. BUT, once rearranged in LR, it does not seem possible to reimport that Aperture Library again as the import process fails to find those LR moved pictures (although Aperture still finds those pictures and are not listed as missing or offline in Aperture. Somehow the Aperture Library links to the pictures fail to give LR sufficient information to find them. I have rebuilt the Aperture library, put the pictures back to their original folder location and a few other strategies without success. I know this is a long note, but creating a legacy LR catalog for me is critical so other family members can find pictures. I only wish Apple would have come out with an Aperture Library reader that would be stable going forward, preserving the Aperture edits. Thanks in advance. Moderator: The questions being asked here are very specific. Please don't tell the poster to do something else, that's not an answer to the questions being asked. If you feel that what you are saying is important, find a thread where it answers the question(s) being asked. Responses that don't help with the question being asked are scheduled for deletion.