The key to all this functionality is Microsoft's SkyDrive service, which provides 25GB of free file storage. You can see the relationship between SkyDrive and other Microsoft services and software as well as mobile devices in the diagram above. You can upload and store files of any type to SkyDrive using a simple Web interface. Once there, files can be manipulated: move, copy, edit, rename, or download them. SkyDrive also provides access to and storage for the free Microsoft Office Web Apps service. Office Web Apps includes versions of Word, Excel, PowerPoint, and OneNote that run in major Web browsers including Firefox and Chrome.