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Office 2013: new look, new licensing models
For this new Office edition, Microsoft is thinking outside the (shrink-wrapped) box. You can get Office 2013 in subscription editions that include the right to install the program onto five devices, to "stream" it onto additional devices for temporary use, and to create and edit files using Office Web Apps.
For details on what's in Office 2013 and how you can try the preview version, see: Office 2013 preview: editions at a glance and FAQ.
Install Office desktop apps from the Web
An Office 365 subscription includes the right to install the Office 2013 desktop apps on up to five computers. The Click-To-Run packages install quickly—typically within minutes over a broadband connection.
Introducing SkyDrive Pro
Default storage for Office 365 ProPlus is online, in SkyDrive Pro. The online environment (which bears a striking resemblance to SharePoint) also offers online access to email, calendar, and contacts (on the People tab).