Microsoft is working on web versions of its popular office suite that not only replicates the functionality of the desktop apps but also provides a synchronized approach bringing together the online and offline worlds.  Documents can be opened on different devices simultaneously in desktop apps and on the web. Changes made are synced to all devices that have the document open instantly.  Additionally, there is cross browser support including Firefox that Microsoft demoed in the PDC Keynote today

Read the Microsoft Press Release

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