Finally, Office 365 ProPlus is for enterprises and comes with additional features designed for IT departments and large companies.

Specifically, Office 365 Pro Plus also includes Lync and the form-creation application InfoPath, and each subscriber can use it on as many as five different PCs or Macs.

The fact sheet also mentions a traditional client-software suite for enterprises called Office Professional Plus 2013, which comes with Word, Excel, PowerPoint, Outlook, OneNote, Access, Publisher and Lync.

In the same fact sheet, Microsoft also detailed a fourth edition, called Office 365 Enterprise, which comes with Exchange Online, SharePoint Online and Lync Online.

The locally installed Office 2013 suites will be able to tap into the cloud in different ways to interact with online products such as SkyDrive, so that users will be able to save documents on a Microsoft server and access them from different devices.