Microsoft Defender for Office 365 is a cloud-based email filtering service that helps protect your organization against advanced threats to email and collaboration tools, like phishing, business email compromise, and malware attacks. Defender for Office 365 also provides investigation, hunting, and remediation capabilities to help security teams efficiently identify, prioritize, investigate, and respond to threats.

The following are the primary ways you can use Defender for Office 365 for message protection:

In a Defender for Office 365 filtering-only scenario, Defender for Office 365 provides cloud-based email protection for your on-premises Exchange Server environment or any other on-premises SMTP email solution.

Defender for Office 365 can be enabled to protect Exchange Online cloud-hosted mailboxes. To learn more about Exchange Online, see the Exchange Online service description.

In a hybrid deployment, Defender for Office 365 can be configured to protect your messaging environment and control mail routing when you have a mix of on-premises and cloud mailboxes with Exchange Online Protection for inbound email filtering.

Available plans
For detailed plan information on subscriptions that enable users for Microsoft Defender for Office 365, see the full subscription comparison table.

Feature availability
The following table lists the major Microsoft Defender for Office 365 features available across plans. Certain caveats apply. See the footnotes for further information. This table may change without notice.

Licensing terms
For licensing terms and conditions for products and services purchased through Microsoft Commercial Volume Licensing Programs, see the Product Terms site.

For Microsoft Defender for Office 365 Plan 1 tenants, licenses must be acquired for users or mailboxes falling under one or more of the following scenarios:

Any user that accesses a mailbox that benefits from Defender for Office 365 protections.
Shared mailboxes that benefit from Defender for Office 365 protections.
If Safe Attachments protection for SharePoint, OneDrive for Business, or Teams is turned on, all users that access SharePoint, OneDrive for Business, or Teams.
Any user that uses Microsoft 365 Apps or Teams when Safe Links protections are enabled.
For Microsoft Defender for Office 365 Plan 2 tenants, licenses must be acquired for users or mailboxes falling under one or more of the following scenarios:

All Exchange Online users on the tenant. This is because Plan 2 features and capabilities protect all users in the tenant.
All shared mailboxes on the tenant.
If Safe Attachments protection for SharePoint, OneDrive for Business, or Teams is turned on, all users that access SharePoint, OneDrive for Business, or Teams.
Any user that uses Microsoft 365 Apps or Teams when Safe Links protections are enabled.

Messaging
To stay informed of upcoming changes, including new and changed features, planned maintenance, or other important announcements, visit the Message Center. 

Accessibility
Microsoft remains committed to the security and the accessibility  of data on Citrix Virtual Desktop.  

To learn about O365 Cloud Backup visit, O365CloudExperts.