Microsoft Sues Motorola Over Android Phones

Microsoft filed patent infringement complaints against Motorola and its Android phones in the International Trade Commission and U.S. federal court Friday, indicating that the software giant may hope to use its strong patent position as one way to set its mobile software apart from the competition.

Microsoft said that Motorola's Android phones infringe nine patents, including some that would appear to threaten most smartphone platforms. Android is the open source OS built by Microsoft rival Google.

The patents appear to include some related to Microsoft Exchange ActiveSync, which syncs e-mail, calendar and contacts between a mobile phone and a software-based computer program, according to a blog post written by Horacio Gutierrez, general counsel at Microsoft.

Other patents involve technology that displays signal strength and battery power on phones.