Microsoft To-Do is eventually meant to replace Wunderlist, but the current version lacks some basic features present in that app.
One of those is list sharing, meaning you and your partner could have a common shopping list for example.
Now WindowsArea.de reports that the next version of Microsoft To-Do will allow users to send an invitation link to contacts, which will then allow them to view and alter lists in the app.
The feature is of course long overdue, and should instantly expand the market for users of the app, especially when it comes to all the mobile versions of the app also.
Find the app in the Store here.