This conversation has been merged. Please reference the main conversation: Lightroom: Virtual copy using a new xmp file
Chief among the things that are not exported is Collections, but there are other items, such has virtual copies, history, publish services, certain metadata, and stacks (I am sure people can name others that I do not know about).
This makes it harder to share such things with other users and with Bridge; it also creates uncertainty. As a non-techy I never know what's in the catalogue and what's in the xmps.
I have started writing all collection info into keywords, which is time consuming and error-prone.
A way to export collection and VC information, at a minimum, would be great.