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Pro Allows for real-time collaboration
Multiple people can work on the same document at the same time.
Pro Easy to transition from MS Office
Office 365 is laid out the same way with a similar ribbon interface that will be instantly comfortable to long-time Microsoft Office users.
Pro Excellent integration and compatibility with MS Office desktop applications
Pro No installation required
Con Has only a fraction of Microsoft Office functionality
Office 365 is not a complete replacement for Microsoft Office. The most advanced functionality still can only be found on the desktop.