Office 365

Office 365 Enterprise E1

Online versions of Office with email and video conferencing
Email with 50 GB mailbox
1 TB file storage and sharing
HD video conferencing
Office Online
Team sites

Office 365 Business

Full Office on PC/Mac with apps for tablets and phones
(Email not included)
1 TB file storage and sharing
Fully installed Office on PC/Mac
Office apps on tablets and phones

Office 365 Enterprise E3

All the features of ProPlus and E1 plus compliance tools, information protection, and voicemail integration
Unlimited email storage for in-place archive
Advanced email with archiving and legal hold
Unified eDiscovery center
Rights management, data loss prevention, and encryption
Hosted voicemail support

Office 365 Enterprise E5 without PSTN Conferencing

All the features of E3 plus a new class of unified communications solutions with advanced Skype for Business meetings and voice capabilities
PSTN conferencing to dial in to Skype meetings from anywhere
Cloud-based call management
Advanced analytics with Power BI Pro and Microsoft MyAnalytics
In-place, Advanced eDiscovery
Advanced security with Advanced Threat Protection and Customer Lockbox

Office 365 Plan 1