

Mimecast Advanced Email Security and Microsoft Defender for Office 365 are top contenders in the email security solutions market. Microsoft Defender for Office 365 has an edge due to its comprehensive features and user satisfaction, even at a higher cost.
Features: Mimecast Advanced Email Security includes strong email gateway features, effective archiving, and sandboxing for threat protection. Email filtering scans links and attachments efficiently. Microsoft Defender for Office 365 offers seamless Office application integration, data loss prevention, phishing protection, and real-time threat intelligence suited for Microsoft environments.
Room for Improvement: Mimecast needs to lower prices, improve detection rates, and streamline report submissions for malicious emails. Reviewing support quality and reducing data extraction fees are also necessary. Microsoft Defender for Office 365 should enhance support for non-Microsoft file types, simplify customer alerts, and provide more comprehensive documentation. Its licensing model is complex and could be improved for smaller businesses.
Ease of Deployment and Customer Service: Mimecast offers flexibility across environments but relies on a strong knowledge base and sometimes delayed support. Microsoft's integration within its ecosystem simplifies deployment but is hampered by a complex interface. Customer support is effective but could benefit from proactive user engagement.
Pricing and ROI: Mimecast is expensive, with additional fees for data access affecting ROI despite strong performance. Microsoft Defender for Office 365, while costly, offers cost-effective security within its licensing plans, particularly for enterprises using Microsoft 365, justifying the higher price through seamless integration.
It has also decreased our time to detection and response by about 15 to 20 percent.
Overall, cost of owning and operating our system goes down.
It's hard to quantify the return on investment we've seen from Microsoft Defender for Office 365.
There is definitely a return on investment when using Mimecast, as it blocks phishing emails, reducing the risk of significant financial losses.
Over the past two years, there have been no critical problems.
we opened tickets, and they typically resolve them quickly.
With a subscription for Microsoft Defender for Office 365, it is an eight. Without it, it is a six.
Support personnel are hesitant to engage in remote sessions, preferring to share documentation via email.
Mimecast technical support is generally quite good.
I would rate my experience with technical support of Mimecast Email Security between seven and eight out of ten for their support.
We have never faced scalability problems, and Microsoft manages it effectively.
Microsoft Defender for Office 365 scales transparently for us, as we grew from 1,000 users to 3,000 users, and we didn't notice much difference.
Microsoft Defender for Office 365 scales with the growing needs of my company well.
If Mimecast Email Security introduces API solutions, it will dominate the market.
I would rate the stability of Microsoft Defender for Office 365 as 10 over 10 because it's highly available, it works, and it does the job it is meant to do.
I have not experienced any downtime, crashes, or performance issues because of Defender.
The solution is stable, as we have been using it for the past two years.
They confirm it's a good solution where only one or two rare emails get through, while the rest are properly blocked without any issues.
The main area for improvement is simplifying the implementation and rollout process.
Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published.
There is a different console for different things; I just want one consolidated console.
A lot of emails were missed despite being known samples.
Mimecast Email Security is somewhat expensive compared to the competition in the Indian market.
We discussed the phishing aspect, the DNS system, and the key rotation.
We've likely saved 30% of costs.
Money-wise, it is a part of the Office 365 suite, making it slightly more expensive compared to Trend Micro.
Microsoft is quite affordable with a lot of features available for any size organization.
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
It ranks the threats and allows us to prioritize those hitting us the hardest, such as email threats.
It provides end-to-end visibility on email threats such as phishing, extending beyond Exchange Online Protection.
The value of the DLP feature is significant to us because we have internal data, sometimes sensitive, and the users may not always be aware of security and privacy, which might lead them to send out information mistakenly to external parties.
A distinct advantage of Mimecast is its ability to block phishing and impostor attacks, which are significant threats currently.
One of the most useful features is the threat remediation module, which can be used to remove malicious emails that may have been delivered or manually remove them.
Mimecast Email Security includes the best gateway solution across all Cisco, Trend Micro, and other solutions.
| Product | Market Share (%) |
|---|---|
| Microsoft Defender for Office 365 | 21.4% |
| Mimecast Advanced Email Security | 16.5% |
| Other | 62.1% |

| Company Size | Count |
|---|---|
| Small Business | 23 |
| Midsize Enterprise | 10 |
| Large Enterprise | 31 |
| Company Size | Count |
|---|---|
| Small Business | 17 |
| Midsize Enterprise | 7 |
| Large Enterprise | 11 |
Microsoft Defender for Office 365 is a comprehensive security solution designed to protect organizations against advanced threats in their email, collaboration, and productivity environments. It combines the power of Microsoft's threat intelligence, machine learning, and behavioral analytics to provide real-time protection against phishing, malware, ransomware, and other malicious attacks.
With Microsoft Defender for Office 365, organizations can safeguard their email communication by detecting and blocking malicious links, attachments, and unsafe email content. It employs advanced anti-phishing capabilities to identify and prevent sophisticated phishing attacks that attempt to steal sensitive information or compromise user credentials.
This solution also offers robust protection against malware and ransomware. It leverages machine learning algorithms to analyze email attachments and URLs in real-time, identifying and blocking malicious content before it reaches users' inboxes. Additionally, it provides advanced threat-hunting capabilities, allowing security teams to proactively investigate and respond to potential threats.
Microsoft Defender for Office 365 goes beyond email protection and extends its security features to other collaboration tools like SharePoint, OneDrive, and Teams. It scans files and documents stored in these platforms, ensuring that they are free from malware and other malicious content. It also provides visibility into user activities, helping organizations detect and mitigate insider threats.
Furthermore, this solution offers rich reporting and analytics capabilities, providing organizations with insights into their security posture and threat landscape. It enables security administrators to monitor and manage security incidents, track trends, and take proactive measures to enhance their overall security posture.
Mimecast Advanced Email Security provides essential features like spam filtering, email archiving, and threat remediation, enhancing email protection. Its integration with Microsoft 365 and user-friendly administration console improve usability while blocking phishing and imposter attacks.
Mimecast Advanced Email Security is an important tool for organizations combating email threats such as phishing and malicious attachments. Acting as a cloud-based email gateway, it delivers threat protection and email archiving while supporting compliance requirements like HIPAA. Features such as URL inspection, identity protection, impersonation policies, and DMARC Analyzer ensure robust security. Despite its comprehensive capabilities, users find pricing high with room for improvement in detection rates and interface simplification. Additionally, blocking flexibility and outbound mail server blocklisting challenges signal areas for enhancement.
What are the key features?Mimecast Advanced Email Security is deployed across industries like healthcare, finance, and legal sectors where email threats are prevalent. Companies leverage phishing detection, data compliance, and behavior analysis with ease due to its scalable and cloud-based capabilities. Its robust features support enhanced protection and communication integrity.
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