Office 365 Business Essentials includes:
Use business-class email through a rich and familiar Outlook experience you can access from your desktop or from a web browser. Get a 50 GB mailbox per user and send attachments up to 150 MB.
File storage and sharing
OneDrive for Business gives each user 1 TB of personal cloud storage that can be accessed from anywhere. Easily share documents with others inside and outside your organization and control who can see and edit each file.
Host online meetings with audio and video using one-click screen sharing and HD video conferencing.
Connect with other Skype for Business users via instant message, voice calls, and video calls, and let people know your availability with your online status. Share presence, IM, and audio calling with Skype users.
Corporate social network
Yammer collaboration software and business applications allow your employees to connect with the right people, share information across teams, and organize around projects so they can go further, faster.