For readers who know about Dropbox, ownCloud will be an intuitive find. The services are similar. They both provide online storage space for documents, graphics, mp3s, and other files. They both make sharing files with friends and coworkers simple and allow access from mobile devices and multiple desktops. However, more sophisticated users may prefer ownCloud for at least two reasons. First, as an open-source system, it is more flexible, so that users can adjust the services to their needs. Second, while Dropbox charges for extra storage, users can store huge amounts of data on ownCloud for free. The only catch is that users will need to run and install ownCloud on their own server. This is relatively simple for those who have a website and a little knowledge of hosting.