MTreeSize is a free software for Windows Mobile Professional that will make your life easier if you’re a person to whom every byte on your device counts.

The application will allow you to manage your folders by giving you information based on their sizes, so that you can have a visual look at the contents of your device and instantly see what folders occupy what amount of space. It will display the information in a friendly tree view, so MTreeSize will show you all folder sizes by recursively going through all subfolders, for both Device and Internal Storage/Storage Card.

You can choose between tree view of folders arranged by size, list view of files arranged by size and a central screen of drives (Device, Internal Storage/Storage Card and Bluetooth sharing folder – which acts like a drive in Windows Mobile) and their space status. Furthermore, you can have folders excluded from calculation and the app will not count these, but display them with a special red icon.