For way too many years, there was no other way to read Apple's own E-books on a Mac. It was baffling. That's how I discovered Calibre. Now that Books was final

For way too many years, there was no other way to read Apple's own E-books on a Mac. It was baffling. That's how I discovered Calibre. Now that Books was finally added to Mac OS, I've put all of them in there so I can sync collections across all my (albeit Apple-only) devices.