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If you share a folder with another person, its contents sync to their computers, and they have full read-right access to everything in that folder. You can use email to invite another person (they have to have a Dropbox account), or you can pick from a list of Facebook friends.
To grant read-only access to files and folders, use the "Get a link" options. Anyone who accesses the files using that link can make a copy, but can't change the contents of the original file or folder.
SkyDrive's file and folder listings are much more dense with information than their Dropbox counterparts. You can filter the list, showing only photos or documents, for example, using links in the left pane.
The information under the Shared With heading makes it easy to see whether a folder is public, shared with some people, or completely private. Those four small icons above the Files list--Word, Excel, PowerPoint, and OneNote--offer a hint of what's supported in the Office Web Apps.
Microsoft released the long-awaited utility that connects Windows Explorer to a SkyDrive account so that files can automatically be synced. Like Dropbox, SkyDrive lets you choose where to create your local folder for sync purposes. It then adds a shortcut in the navuigation pane.
The green checkmark overlay shows synced files, which otherwise look and act exactly as if they were stored only locally.