As his tech news reporter had reported at the time Mashable, Alex Perry, this means that, "your reminders and lists will no longer work through Cortana. They will continue to sync with the application Microsoft To Do, as a small consolation prize.»
The latest support announcement of the website tries to undo these difficult conditions by emphasizing a new way in which users can "manage their diary and email, attend meetings and do much more, in a way that focuses on productive experience - such as experience Cortana Windows 10, the integration of Cortana in Outlook mobile and soon the voice assistant of the virtual assistant in the application Teams for mobile phones.»
Perhaps a more immediate concern is that Microsoft has also announced that it will be shutting down all third-party applications on September 7th. Third-party skills are what allow Cortana to be useful when it comes to non-Microsoft services, such as asking it to play music from Spotify.
This seems to be the last big step in phasing out Microsoft Virtual Assistant from Android or iOS mobile phones. It probably won't be a huge hit for many, as Cortana rivals iOS Siri and Google Assistant for Android, both of which are integrated into their respective operating systems.
So far, there is no official statement from Microsoft as to whether it will withdraw completely from the digital assistant game.