Sendo in November cancelled all cooperation with Microsoft when it was just weeks away from launching a mobile phone running on Microsoft software. Microsoft is a minority shareholder in Sendo.
At the time Sendo declined to give all the reasons for the split, saying only that it had not been given access to so-called 'source code' which would allow it to tailor the software.
It made clear there were more important reasons behind the move, but declined to give details for legal reasons. Sendo has filed the suit in Texarkana, Texas.
Sendo went on to sign a contract with Microsoft rivals Symbian of Britain and Nokia of Finland, sacrificing a potential 300 million euro revenue stream from its Microsoft-based phone. It had already signed supply deals with many mobile telecoms carriers around the world.
Had Sendo continued to work with Microsoft, it would have established the British firm as the leading partner in Microsoft's attempt to crack the mobile phone business.
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