I'd been using Syncbox to synchronize my mp3 files between my desktop and laptop. As part of a re-review of synchronization services, I've been double-checking them all only to find that Syncbox changes the time stamp on EVERY FILE from date last modified to the date copied! I don't kow how I missed this before. Likely because I seeded everything before running Syncbox. In any case Syncbox is being removed from my computers as I type this!