We held several years' worth of lots of photos on a Windows laptop in Photoshop Elements. When the hard drive crashed, I restored the files from our backup drive onto our new Macbook. I've lost the star ratings, which we were about to use to select photos for printing. Apologies for the lack of technical detail, I understand that you should save metadata with the files, but this was presumably not done at the time.
Many thanks, Naomi