Microsoft To Do update is rolling out to all Windows 10 and Windows 10 Mobile users. It lets you star your most important to-dos in each list and it can be filtered by it’s importance. The update should show up on your devices in the coming hours or days. It’s also added attributions in shared lists, so you’ll be able to see who’s added and completed each to-do in the smart list. You’ll be also able to add attributions to your list and see who has completed each task.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-to-do-update-for-windows-10-rolling-out-with-new-importance-list/