The ruling is that if the read aloud feature is disabled due to DRM, then it is OK to remove the DRM so the read aloud function works. MS Reader has a read aloud function. The DRM turns that off. So removing the DRM is legal in this case. Once the DRM is gone, Clibre or Book Designer can help in converting. Though given how large these books are, I'd go with Calibre for a much easier conversion.
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