Microsoft To Do already allows you to share your to do lists with others. To share a list, you need to create an invitation link and share the link with others using email or messaging app. Microsoft To Do supports list sharing for the following scenarios:
- Sharing between personal Microsoft accounts.
- Sharing between accounts within the same place of work or education.
- Sharing from personal Microsoft accounts to work accounts, as long as an organization’s admin has turned this feature on.
Microsoft has recently announced that it is working on a revamped sharing experience for Microsoft To Do. This new invite-less list sharing in To Do will allow users to share the list with others using their names/email-ids. This new sharing experience is coming in February 2021.