Which system is supported for Server Connections with Mimecast?

Office 365 is supported for Server Connections with Mimecast due to its robust integration capabilities and widespread adoption in modern organizations. Mimecast provides email security, archiving, and continuity solutions that are designed to work seamlessly with Office 365, taking advantage of Microsoft's cloud infrastructure. This compatibility allows for enhanced email protection against threats such as phishing and malware, along with reliable archiving and backup solutions that meet compliance requirements.

Additionally, Office 365's API-based connectivity aligns well with Mimecast’s architecture, enabling features like real-time threat detection and advanced reporting tools. This makes it a preferred choice for many businesses utilizing cloud-based email services.

The other systems may not provide the same level of integration or may not be as current in terms of Mimecast's support and updates, which can limit functionality and security features that modern businesses require.