FlorianMueller writes "As if there weren't already enough patent suits related to smartphone technologies, Motorola just announced its widely anticipated countersuit against Microsoft. Its subsidiary Motorola Mobility filed complaints with two US District Courts (Southern District of Florida and Western District of Wisconsin). Motorola already litigates with Apple in those and other courts. According to Motorola, the patents relate to technologies in the fields of operating systems, video codecs, email, instant messaging, object-oriented software architectures, WiFi, and graphical passwords. Motorola claims Windows, the Live messenger, Windows Phone, Outlook and other Microsoft products infringe. Motorola's action is no surprise given that all of the companies sued over patent infringement by Android — with the exception of Google — have already countersued."