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richardhc,
I also use Calibre at both Win [office desktop] and a Mac laptop, but don't import the books separately into the libraries from machine to machine. I have found that if I store the library in a Dropbox subdirectory, I can access it from either OS, and books added in one are accessible in the other. The caveat is that I need to let the Dropbox files sync when I turn on the computer and before I open Calibre. If I have not been doing massive editing - as I did last week - that doesn't take long. to sync a few books and the metadata.db files. If I open Calibre before the sync, obviously, the information already on the computer is used, and I can get conflicts, or accidentally overwrite newer data with older.
All of the metadata, covers and description sync seamlessly between the two installations. Would something like Dropbox or other cloud storage work for your situation?
FWIW, a library of close to 3,000 books takes up about something under 4GB, including the covers, descriptions, book files, a lot of custom columns, etc. I don't have an exact number as I have a fair bit of other stuff in my Dropbox directories.
Hope this helps,
GeekyGal
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