Microsoft's dispute with Foxconn pits one of the tech world's biggest names - against one its biggest contract manufacturers.
The US software maker filed a patent infringement lawsuit on Friday .... Against Foxconn subsidiary FIH Mobile ... Claiming unpaid royalties for patents used in devices for clients including a top Chinese smartphone vendor.
But - from Foxconn - there's been a robust reaction.
With founder and chief executive Terry Gou getting personally stuck in.
The patent infringement is not an issue for his firm, he said - which - quote - "has never paid any patent fees to Microsoft".
And added his firm "will suffer almost no loss" from the lawsuit.
Foxconn is the trading name of Hon Hai Precision Industry Ltd, and rose to global prominence as an assembler of Apple iPhones.
Microsoft said the legal action was related to a contract it signed with Hon Hai in 2013.
Gou questioned why a software company wouldn't earn royalties from vendors using the software.
"They should not," he said, "pick on manufacturers."