Fanbox is a free online operating system. The interface of FanBox is similar to Windwos Vista, and it provides a series of tools such as instant messaging and document processing internally. You can also add more online programs. It provides up to 2GB of free online storage space and offers a synchronization tool. Through this synchronization tool, you can automatically upload documents such as pictures, videos, or music to the free storage space and also share files with friends.