Microsoft’s personal assistant Cortana will no longer be supported on mobile platforms such as iOS and Android effective January 31st of 2020. This essentially means that Microsoft will be pulling out of the very competitive personal assistant industry, which is primarily dominated by Amazon’s Alexa and Apple’s Siri. This information came to light during Microsoft’s most recent Ignite conference, where they expressed their intent to shift the primary functionality of Cortana to better assist commercial users.
Source: https://slashdot.org/story/19/11/18/1611220/microsoft-winds-down-its-bigger-plans-for-cortana-with-mobile-app-shutdown