https://techcrunch.com/2019/11/18/microsoft-winds-down-its-bigger-plans-for-cortana-with-mobile-app-shutdown/

At Microsoft’s Ignite conference this month, the company announced a new vision for its personal productivity assistant, Cortana — one which aimed to make it more useful in your day-to-day work, including email, but one which also saw Microsoft scaling its ambitions back from Cortana as a true Siri, Alexa or Google Assistant competitor. Now, the other shoe has dropped, as Microsoft says it’s planning to shut down its standalone Cortana mobile apps across a number of markets.

The company quietly revealed its plans to wind down support for Cortana on iOS and Android in several regions, with an end-of-life date of January 31st, 2020. After this point, Cortana mobile app will no longer be supported. Microsoft also said it will release an updated version of its Microsoft Launcher, that will have Cortana removed.