You can add the new version of OneOffice as an app on your phone or device.
To do so you will need to be using the browser that is native to the device you are on (for example, for Apple devices, this is Safari browser).
Open the application in your browser on a device that supports 'app' installs.
Click on options, or the ‘Share’ button
Click on 'Add to Home Screen'. This will then create an app on your home screen that you can use to access the site.