Techcrunch is reporting that Microsoft has offered $1 billion (precisely one Instagram) to buy the digital assets of Nook Media LLC, the digital book division of Barnes and Noble. Microsoft had previously taken a $300 million share of the bookstore's e-reader business last year at a valuation of $1.7 billion, which led to benefits for Nook users on the Windows 8 platform (eg. free books). Techcrunch's report also indicates that the Nook business may be phasing out its Android-based tablets in 2014, and letting its e-readers naturally phase out as more subscribers adopt e-book reading on all-purpose tablets and phones. To date, Barnes and Noble has sold 10 million Nook devices.