Microsoft announced a major change to its browser strategy today: only Project Spartan, the company’s new browser shipping on all Windows 10 devices (smartphones, tablets, PCs, and so on), will feature the company’s new rendering engine. Internet Explorer will still ship with Windows 10, but Microsoft says it “will remain fundamentally unchanged from Windows 8.1″ and will use the legacy engine exclusively.

This is a big adjustment following the browser’s announcement in January, when Microsoft laid out plans to use the new rendering engine to power both Project Spartan and Internet Explorer on Windows 10. Both browsers were supposed to be able to switch back to IE’s old Trident rendering engine when they encountered legacy technologies or certain enterprise sites.

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