In order to be able to open .mpp files shared via email, if you don’t already have an account created on our website, in the received email, click on the “Open in Project Plan 365” button. You will be redirected to a page to create your account by adding a password. Type in the desired password and click “Next”. Download and install the app by clicking “Download Project Plan 365” button. After installing, go back to browser and click on the “Open in Project Plan 365” button, click again the “Open Project Plan 365” button from the browser request dialog and the app will open. Lastly, Sign In with your email and password for the file to open.