Microsoft Office 365 E5 is a cloud-based subscription service that provides users with access to a suite of productivity and collaboration tools. It is the most advanced version of the Office 365 product line, offering a wide range of features and capabilities designed to meet the needs of enterprise-level organizations.

Some of the key features of Microsoft Office 365 E5 include:

1. Advanced security: Microsoft Office 365 E5 provides advanced security features such as threat intelligence and advanced threat protection, allowing organizations to protect their data from external threats.

2. Compliance: The service also includes compliance features such as eDiscovery and legal hold, which help organizations meet their compliance obligations and manage legal requests.

3. Advanced analytics: Microsoft Office 365 E5 includes advanced analytics features, such as Power BI Pro and Delve Analytics, which help organizations gain insights into their data and make informed business decisions.