A free program for Android, by Microsoft Corporation.

Loop is a free, secure, and easy way to collaborate on your ideas and projects. It offers real-time audio and video communication, the ability to share and view files, as well as online and offline tasks. 

You can use it with any of your existing accounts and tools, including Outlook, Word, Excel, PowerPoint, OneNote, and others.

How can I get started?

1. Download and install the Loop app.

2. Log in with your existing accounts and tools, or create a new one.

3. Start collaborating on your ideas and projects.

4. You can add tags, assign team members, and add comments to the task.