Looking at the evolution of the cloud, as a file share and sync solution, everything started with centralized services and evolved to to the point where everybody can set up his own Cloud with Free Software. Decentralizing the cloud was a important step but at the same time it created islands. Only user on the same instance can collaborate on the same files. The next step will be to connect this individual clouds to enable the users to collaborate seamlessly across multiple instances. The ownCloud project works actively on this idea, this talk will discuss the general idea behind it and how this is going to happen.