Have a look at this chart that best summarizes the state of the tech industry- legally speaking, of course. As you will see, everyone is suing everyone!
http://www.guardian.co.uk/technology/2010/oct/04/microsoft-motorola-android-patent-lawsuit#zoomed-picture
http://www.guardian.co.uk/technology/2010/oct/04/microsoft-motorola-android-patent-lawsuit#zoomed-picture
![mobilemadness101008-1120-460.png](/proxy.php?image=http%3A%2F%2Fstatic.guim.co.uk%2Fsys-images%2FTechnology%2FPix%2Fpictures%2F2010%2F10%2F8%2F1286533302868%2Fmobilemadness101008-1120-460.png&hash=408039a3322d0f68fc6c5490995bbad7)