A company called SurfCast has filed the suit over its patent #6,724,403 which is all to do with how content is organised and displayed.
"The present invention comprises a graphical user interface which organizes content from a variety of information sources into a grid of tiles, each of which can refresh its content independently of the others.
"The grid functionality manages the refresh rates of the multiple information sources," the patent reads.
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It sure sounds a lot like Live Tiles – and Surfcast is after recompense for any Windows Phone 7, Windows Phone 8, Windows 8 and Windows RT device using them.
But Microsoft's been showing off bits and pieces on device homescreens using its dynamic tiles since Windows Phone 7 launched in October 2010; why is Surfcast suddenly all up in Microsoft's grill over it now?
It's all to do with the Microsoft Surface and the potential payout that Windows 8 will afford, given that Windows Phone hasn't exactly made anyone a bundle.
Surfcast also says Microsoft is encouraging other companies to infringe its patent by urging devs to build app tiles for the Windows Store and allowing manufacturers to sell Windows 8 and Windows Phone devices.
We don't expect to see this result in multiple years' worth of litigation between the two companies a la Samsung vs Apple – as The Verge suggests, Microsoft will likely settle with Surfcast out of court and we can all move on.