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Microsoft Corp is moving to retool Cortana, its digital voice assistant that has struggled as the software giant shackled it to the personal computer.
When the assistant — named after a character from the Xbox videogame franchise “Halo” — was introduced four years ago, it was only available through the Windows operating system, a strategy that hobbled Cortana as voice computing took off in a new era of smart speakers.
Amazon.com Inc introduced its Alexa digital assistant seven months after Cortana’s launch, but its Echo and sibling devices now control two-thirds of the US smart-speaker market, according to research firm eMarketer. The
