You can access your data from all your devices, regardless if you are on- or offline.
Besides that, the Word, Excel and PowerPoint apps can be used on 5 different mobile devices. Office 365 ProPlus can be installed on 5 devices, both on Mac and Windows. With Office 365 ProPlus you can use the newest versions of the Office applications. Microsoft Office 365 ProPlus contains the desktop version of Microsoft Office with Word, Excel, PowerPoint, Visio (limited number of licenses available) and Outlook in one package.