From the 43 Pages dept.:
According to legal observer site Groklaw, Barnes & Noble has filed a supplemental notice of prior art that contains a 43-page list of examples Barnes & Noble believes counters Microsoft's claim that Nook violates five of Microsoft's patents.

Barnes & Noble is being particularly noisy about the patents Microsoft is leveraging against the Nook, as it sees Microsoft as launching this lawsuit against Barnes & Noble and co-defendants Foxconn and Inventec as an effort to derail the Android operating system and device sales, as opposed to a genuine need to protect Microsoft's innovation.