Motorola has launched a countersuit against Microsoft, citing the breach of 16 patents in the software firm's PC and Server, Windows Mobile and Xbox products.
Microsoft is accused of infringing patents in digital video coding, email technology including Exchange, Messenger and Outlook, Windows Live instant messaging and object-oriented software architecture.
Motorola has also cited patent infringements in Windows Marketplace, Bing maps, Xbox digital video coding, Wi-Fi and graphical passwords.
"Motorola has requested that Microsoft cease using Motorola's patented technology and provide compensation for past infringement," the firm said in a statement.
Kirk Dailey, corporate vice president of intellectual property at Motorola, noted that the company is committed to protecting the interests of its shareholders, customers and other stakeholders.
"Motorola has invested billions of dollars in R&D to create a deep and broad intellectual property portfolio, and we will continue to do what is necessary to protect our proprietary technology," he said.
The countersuit comes just 24 hours after Microsoft sued Motorola for demanding excessive and discriminatory royalties for patents relating to wireless local area network and H.264 video coding technologies.
Dailey noted that it is "unfortunate that Microsoft has chosen the litigation path rather than entering into comprehensive licensing negotiations".
Microsoft is reviewing the Motorola filing, according to Horacio Gutierrez, corporate vice president and deputy general counsel for intellectual property and licensing at Microsoft.
"This move is typical of the litigation process and we are not surprised," he said in a statement.
"We remain confident in our position and will continue to move forward with the complaints initiated against Motorola in the US District Court for the Western District of Washington and with the International Trade Commission."
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