I'm on my 3rd Sony and I've never used anything but Calibre. I used to use the Sony software for the occasional book purchase or freebie, but since I can do that now directly over WiFi, I never use the Sony software at all. I had to reinstall it to do the latest update, but then I uninstalled it again.
So far from needing it for the WiFi, the WiFi renders it unnecessary.
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