Microsoft Office 365 is a cloud-based service that is designed to help meet your organization’s needs for robust security, reliability, and user productivity. Microsoft Office 365 delivers the power of cloud productivity to businesses of all sizes, helping save time, money, and free up valued resources. Office 365 combines the familiar Microsoft Office desktop suite with cloud-based versions of Microsoft’s next-generation communications and collaboration services—including Microsoft Exchange Online, Microsoft SharePoint Online, Office Online, and Microsoft Lync Online—to help users be productive from virtually anywhere through the Internet.

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Please see all product comparison below:

Office 365 Business Essentials Office 365 Business Office 365 Business Premium Office 365 Enterprise E1 Office 365 ProPlus Office 365 Enterprise E3 Office 365 Enterprise E4
Full, installed Office applications Word, Excel, PowerPoint, Outlook, Publisher, and OneNote on up to 5 PCs or Macs
Office for tablets on up to 5 Windows tablets and iPad® tablets
Office for smartphones to view and edit Office docs on up to 5 phones
Online versions of Office including Word, Excel, and PowerPoint
File storage and sharing with 1 TB storage/user
Business-class email including calendar, and contacts with a 50 GB inbox
Unlimited online meetings, IM and HD video conferencing. Includes Skype for Business
Intranet site for your teams with customizable security settings
Corporate social network to help employees collaborate across departments, locations, and business apps
Enterprise voice capabilities to replace or enhance a PBX