What is Microsoft To Do and how does it work?
Microsoft To Do is a personal task management app that empowers users to track and focus on the things they need to get done. With apps for Android, iPhone, Windows 10, and the web, Microsoft To Do is also on every device you are, syncing automatically and securely via the Microsoft Tasks API, meaning your data lives in Exchange and automatically integrates with Outlook Tasks.
User-level licenses for Microsoft To Do have rolled out to tenants in most Office 365 subscriptions, so customers can configure their access to Microsoft To Do for Windows, iOS and Android on an individual basis.
In addition to controlling access to the app, users with enabled licenses for Microsoft To Do see the Microsoft To Do tile in the Office 365 App Launcher (in the “All apps” section) and on the Office.com portal (in the “Explore all your apps” section).
Please note that visibility of the tile depends on users having enabled licenses for Microsoft To Do and Exchange Online.
Use of Microsoft To Do with a work or school account is subject to a few conditions. In addition to an enabled license for Microsoft To Do, users will also need mailboxes in Exchange Online for tasks in Microsoft To Do to sync and store. Since these are crucial functions of the app, users without cloud-based mailboxes through Exchange Online will not be able to use Microsoft To Do .
Note: Microsoft To-Do on the web will soon no longer require a To-Do license, as it's being made a part of Outlook on the web, which is licensed through Exchange Online.
Since Microsoft To Do uses Exchange Online for data storage and synchronization, customers benefit from the reliability, security and compliance they've come to expect. Data is encrypted at rest on Exchange servers and in transit to and from the Microsoft To Do app on your browser or device.
The Microsoft To Do web app hosted on https://to-do.office.com is developed according to industry compliance standards (as are the native apps for Microsoft To Do) and the web app has also been through audits, such as the SOC 2 (Service Organization Controls) Type 1 audit.
If you're the administrator for an organization, you can get help at Contact Office 365 for business support - Admin Help.