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In a nutshell, Office 365 is a collection of apps and cloud services that you can use to be productive across a variety of devices from just about anywhere. Several different subscriptions are available to suit different needs. For example, some subscriptions are for business use, and others for home use. Most include the latest release of Office that you can install on your Windows and Mac computers and a variety of mobile devices. All plans include online versions of Word, Excel, and PowerPoint.