Standard features	Enterprise E1	Enterprise E3	Enterprise E4
Maximum Number of Users	Unlimited	Unlimited	Unlimited
Microsoft Office subscription for up to 5 PC's / MAC's per user		Includes desktop versions of Word, Excel, PowerPoint, Outlook, OneNote, Access, Publisher, Lync, InfoPath	Includes desktop versions of Word, Excel, PowerPoint, Outlook, OneNote, Access, Publisher, Lync, InfoPath
Microsoft Exchange Online email service with 25GB storage space per user, shared calenders, 25MB attachments, etc. on your own domain name
Microsoft SharePoint Online with 7GB of personal file storage (SkyDrive Pro), file sharing, intranet site, public website on your domain name (no hosting fees), newsfeeds, collaboration, content management, etc
Microsoft Lync Online for conducting meetings over the web with HD video conferencing, screen sharing, presence, instant messaging and audio calling
Microsoft Exchange Online Protection for real-time multi-layered anti-spam and multi-engine anti-malware protection
Microsoft Office Web Apps for creating and editing Word, Excel, PowerPoint and OneNote files using a web browser
Site mailboxes for storing and sharing email & documents in project-specific folders allowing for easier team collaboration
Office Mobile for iPhone to access, edit and view Word, Excel and PowerPoint documents on iPhones
Office Mobile for Windows Phones to access, edit and view Word, Excel and PowerPoint documents
Active Directory integration for managing user credentials and permissions; single sign-on and synchronization
Archiving and legal hold capabilities plus unlimited storage for compliance needs; data loss prevention (DLP) policies for added compliance enforcement
eDiscovery Center for supporting compliance through search tools across Exchange, SharePoint and Lync
Rights management services for restricting access to documents and email to specific people
Hosted voicemail support with auto-attendant capabilities where voicemails are recorded to Exchange and users can access them from Outlook or a compatible mobile phone
Business intelligence tools for creating advanced dashboards using multiple data sources
Enterprise voice system to enhance or replace your PBX phone system with enterprise calling capabilities

Microsoft World-Class Support	Enterprise E1	Enterprise E3	Enterprise E4
Guaranteed 99.9% uptime for peace of mind knowing that your services are available and backed by a service level agreement (SLA)
Real-time Service Health Dashboard for knowing the status of all of your Office 365 services including detailed information about current and past issues
Planned Maintenance Schedule to keep up-to-date on planned maintenance activities for your Office 365 services
Pre-sales support for helping you with your Office 365 services purchasing decision
Accounts and Billing support for issues or questions related to your account and Office 365 licenses
24/7 Microsoft Community support through blogs and forums staffed with knowledgable Microsoft experts ready to answer your questions
24/7 Virtual Chat agent access through the Office 365 admin center
24/7 Email Support for submitting technical issues to knowledgable Microsoft experts
24/7 Technical Phone Support by Microsoft's global network of experts	24/7 for all issues	24/7 for all issues	24/7 for all issues

Office 365 Administration	Enterprise E1	Enterprise E3	Enterprise E4
Use the Office 365 admin center to administer Office 365
Use the Office 365 portal to administer Office 365
Manage core service settings from Office 365
Use Windows Powershell to manage Office 365
Protect content using Windows Azure AD Rights Management
Read and edit IRM-protected content

User Account Management	Enterprise E1	Enterprise E3	Enterprise E4
Cloud identity
Federated identity (single sign-on)
Office 365 desktop setup
Manage users with Office 365
Bulk upload using .csv files
Directory sync tool
Exchange simple (cutover) migration
Delete accounts by using Office 365
Admin can reset user password from Office 365 or by using Windows Powershell
Users can change their own password
Manage licenses
Manage security groups using Office 365
Multiple administrator role availability

Domains Administration	Enterprise E1	Enterprise E3	Enterprise E4
Username.onmicrosoft.com domain for email, Lync Online and SharePoint Online team sites
Use a custom domain name for email and Lync Online
Use a different provider for email and Lync Online instant messaging
Use name-public.sharepoint.com for your SharePoint Online public website
Use a custom domain name for your SharePoint Online public website
Host a public website with a different provider
Host multiple SharePoint Online public websites with customer domain names
Domain ownership verification for custom domains
Add custom 2nd-level domains
Add custom 3rd-level domains
Add up to 600 custom domains
DNS records managed by Office 365 (full redelegation)
DNS records managed at your DNS hosting provider (partial redelegation)

Reporting	Enterprise E1	Enterprise E3	Enterprise E4
Active and inactive mailboxes
New and deleted mailboxes
New and deleted groups
Mailbox usage
Types of mailbox connections
Received email
Sent email
Received spam
Sent spam
Malware detections in received email
Malware detections in sent email
Top malware
Rule matches for received email
Rules matches for sent email
DLP policy matches for received email
DLP policy matches for sent email
DLP rule matches for received email
DLP rule matches for sent email
IM and audio sessions
Application sharing, dial-in and web conferences
Video, application sharing and file transfer sessions
IM and audio / video conferences
Downloadable email protection reports
Customized reports using Office 365 reporting web services

Service Updates	Enterprise E1	Enterprise E3	Enterprise E4
Regular updates provided to all customers
Notifications sent for major upgrades
Customers can request to delay major upgrades

Networking	Enterprise E1	Enterprise E3	Enterprise E4
IPv4 and IPv6 protocols

Trust & Compliance	Enterprise E1	Enterprise E3	Enterprise E4
Utmost Privacy, Security and Transparency
SAS 70 / SSAE16 Assessments
ISO 27001 certified
EU Model Clauses
EU Safe Harbor
HIPAA-Business Associate Agreement
FISMA Authority to Operate
Microsoft Data Processing Agreement
PCI DSS Level One
PCI-governed PAN data

Blackberry Services	Enterprise E1	Enterprise E3	Enterprise E4
Blackberry Business Cloud Services
Blackberry Internet Service (BIS)