Fortinet FortiMail vs Microsoft Defender for Office 365 comparison

Fortinet and Microsoft are both solutions in the Email Security category. Fortinet is ranked #4 with an average rating of 8.7, while Microsoft is ranked #2 with an average rating of 8.4. Fortinet holds a 3.2% mindshare in Email Security, compared to Microsoft’s 6.9% mindshare. Additionally, 94% of Fortinet users are willing to recommend the solution, compared to 96% of Microsoft users who would recommend it.

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Executive SummaryUpdated on Feb 8, 2026

Fortinet FortiMail and Microsoft Defender for Office 365 compete in the email security category. Microsoft Defender for Office 365 holds an advantage due to its comprehensive integration with Microsoft apps and robust protection features, making it particularly beneficial for Microsoft Office Suite users.

Features: Fortinet FortiMail provides multi-layered email security with features like the FortiGuard Antispam Service, DNS blacklist, PDF scanning, and greylisting. Microsoft Defender for Office 365 offers integrated security with anti-phishing policies, threat protection, and information protection, benefiting users within the Microsoft ecosystem.

Room for Improvement: Fortinet FortiMail needs enhancements in user-friendly interfaces, third-party integration, and reporting capabilities. Microsoft Defender for Office 365 could improve its pricing model, cross-platform integration, and detailed reporting features.

Ease of Deployment and Customer Service: Fortinet FortiMail supports primarily on-premises deployment with hybrid options, offering quality support but facing responses delays. Microsoft Defender for Office 365 fits hybrid and cloud environments well, with competent support, though technical changes may require adjustments.

Pricing and ROI: Fortinet FortiMail is known for being cost-effective, offering flexible options that are generally cheaper than some competitors. Microsoft Defender for Office 365, part of Office 365 bundles, might appear costly upfront but provides significant ROI through integrated enterprise-level security features.

To learn more, read our detailed Fortinet FortiMail vs. Microsoft Defender for Office 365 Report (Updated: April 2026).

Buyer's Guide

Fortinet FortiMail vs. Microsoft Defender for Office 365

April 2026

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Helped 893,244 peers since 2012

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Categories and Ranking

Cloudflare One

Mindshare comparison

As of May 2026, in the Email Security category, the mindshare of Cloudflare One is 1.7%, up from 1.6% compared to the previous year. The mindshare of Fortinet FortiMail is 3.2%, down from 4.9% compared to the previous year. The mindshare of Microsoft Defender for Office 365 is 6.9%, down from 12.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Email Security Mindshare Distribution
Product	Mindshare (%)
Microsoft Defender for Office 365	6.9%
Fortinet FortiMail	3.2%
Cloudflare One	1.7%
Other	88.2%

Email Security

Featured Reviews

Cobe Van Coller

Network Architect at IP Dimension

Cloud security has improved remote access and has reduced costs for smaller client sites

I have used Cloudflare One's Identity-Aware Proxy, and it is quite straightforward from what I have seen so far. The app registration on the Azure side integrates fully into Cloudflare, and I am very satisfied with that part because it is easy to set up. The integration of Cloudflare One's Secure Web Gateway and Zero Trust Network Access works without any issues. That part is pretty automatic, and if you complete the rest of the setup, it comes together by itself with no issues from my side. What makes it nice is that we can actually start replacing on-site firewalls at this stage for the smaller clients because it does not matter if they go to a coffee shop or work from home; they are still secured by the same connection. The hops get shorter and you get better latency. We have done testing to see if it is better. One thing that we did notice with our proof of concept with our current client is that they have people connecting from the UK. When they used their previous VPN solution, uploading CAD drawings and other files to the server took a long time. They mentioned that it is much quicker on Cloudflare One's solution. I definitely believe that is part of the improved performance, and I am satisfied with that as well. What is nice about Cloudflare One is that it makes the setup easier and also easier to train technicians to maintain it. Compared to legacy systems, we do not need to get fancy firewalls in place that are costly. That is definitely also a cost-saver with Cloudflare One.

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Abhimanyu Das

Senior Associate at a tech vendor with 10,001+ employees

Targeted email filtering has reduced spam and phishing and now saves significant investigation time

The best features of Fortinet FortiMail include its techniques and tactics, which are highly effective compared to other solutions such as Microsoft 365. Although Fortinet FortiMail may not be as advanced in some aspects, it is well recognized for its strong performance in handling spam and phishing. It performs thorough mail scanning and also offers a sandboxing feature that enhances protection. Fortinet FortiMail has had a positive impact on my organization by significantly reducing unwanted email activities such as spam and phishing. It provides accurate detection and generates results that often exceed what can be achieved through manual analysis. Since deploying Fortinet FortiMail, I have observed a reduction in investigation time by at least 20 to 30 percent.

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Emeka Ndulu

Cloud Solutions Architect at a tech services company with 201-500 employees

Improves threat visibility and response while reducing manual tasks and training users against phishing

I appreciate the attack simulation feature whereby I get to train users and educate them on how to identify phishing emails and spam emails, as well as the anti-spam protection. It gives me visibility into my threat environment and threat landscape to ensure that I am one step ahead of any likelihood of threats within my environment. I get to detect it and respond, so the threat intelligence is very effective. Microsoft security solutions save my time. It saves money because once I protect my environment, I don't lose money. It has decreased my detection time and my time to respond.

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Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Pros

"It's the endpoint exposition. We don't need to expose our VPN server to the internet and need a zero-test solution. I can apply some conditional access to the endpoint that's connecting to our network to check their security policies or the security condition of their workstation. Once the workstation is trying to connect to my internal network, then I would like to check the discrete condition of these endpoints that are trying to access my internal network. We created some conditional access. We have CrowdStrike, to check if the CrowdStrike is installed, to check if it's updated, and to check for Windows updates. We created some conditional policies to check it."

"The blocking feature is very good."

"Cloudflare Access is a stable solution."

"It's a perfect solution from my perspective; it's easy to understand and easy to configure."

"I'm very satisfied with the environment and the dashboard."

"Cloudflare, in my opinion, was easy to implement."

"The best feature is rate limiting. If I'm expecting 500 visits per hour, Cloudflare will limit the requests if I suddenly get 50,000."

"Clover is the best product globally."

More Cloudflare One pros

"Both logging and reporting are very good, as well as the antivirus profiles, content emails, content profile, and application profile."

"Troubleshooting is very simple because you can see where the email was not delivered and why it would be considered as spam."

"The deployment is simple and once up and running it is easy to manage."

"When combining this solution with other Fortinet products, such as FortiGate, it integrates well and provides a comprehensive protection package."

"Fortinet FortiMail's most valuable features are its performance and security."

"The solution can scale."

"We do have, as of late, spam outbreaks, and this solution has been pretty reliable in dealing with them."

"The user quarantine feature in the solution is good...It is a stable solution."

More Fortinet FortiMail pros

"One of our clients didn't have the budget to invest in a SOC team, but we deployed the solution for them, and they now run a SOC with only one analyst."

"Microsoft Defender for Office 365 has improved my organization's security. It makes it easier to manage the infrastructure without the help of third-party applications."

"Microsoft Defender for Office 365 is a cloud-based email filtering service that helps protect our organization against unknown malware and viruses by providing robust zero-day protection and includes features to safeguard our organization from harmful links in real-time."

"We have seen a return on investment because if we would have received a phishing email, Microsoft Defender for Office 365 would help out to detect the threat instead of crashing down the whole company."

"There are several features that I consider valuable."

"The feature I like the most about Microsoft Defender for Office 365 is that it typically runs in the background—you do not know it is there until you need to access it."

"Scalability-wise, I do not think there are any issues so far."

"The basic features are okay and I'm satisfied with the Defender."

More Microsoft Defender for Office 365 pros

Cons

"The response time for support must be reduced."

"For the topic of improvement, providing some training material is one of my suggestions."

"Our subscription plan for the solution has a limitation of bot signatures."

"Cloudflare DDoS has poor technical support."

"Our customers no longer use Cloudflare because its service is subpar."

"From a logging perspective, it is still a bit difficult to see exactly what users are being blocked with the current views."

"The onboarding process can be improved a little bit."

"The initial onboarding was causing us some confusion."

More Cloudflare One cons

"I think they need to look into it and improve their signatures. This will help with blocking incoming spam emails."

"The only drawback to this solution is that the firmware is frequently updated, and each update results in downtime."

"I don't know if it is possible, but I would like to see Artificial Intelligence and machine learning introduced."

"In my opinion, points for improvement for Fortinet FortiMail include sometimes the speed and fine-tuning the false positive problems, especially with the signed PDF attachments and the whitelist and blacklist."

"Sometimes it takes a little bit too long to determine if an email is good or not. It does delay our email, which does not make users happy."

"Limited ability to upgrade hardware may lead to some performance issues that might otherwise be improved."

"The solution could be improved by providing a virtual machine facility with a complete set of options in the VM setup."

"It would be nice if we could manage the solution from the cloud so I could handle things off-site if necessary."

More Fortinet FortiMail cons

"Microsoft Defender for Office 365 should be more proactive."

"Microsoft Defender for Office 365 could improve by giving customers information on techniques to prevent threats. For example, information about best practices on how to protect their own devices against hackers and scammers, such as educational information or training. This would help others have a better understanding of cyber security. Additionally, there can be more security features added."

"The inbuilt analysis of false positives can be faster. It's not slow, but it can be faster."

"The XDR dashboard has room for improvement."

"They can improve their security in a way where a customer can know if all their attachments are safe or not to open through a report. The solution does its job perfectly, but it never reports to the customer whether those attachments have been stopped before or not."

"About eight months ago, we started to measure the quantity of phishing and spam that we have been receiving, and it has been increasing a lot. That means that protection for our email is not as good as we were expecting."

"Specifically, within Microsoft Defender for Office 365, I want it to improve the DLP capabilities."

"The inbuilt analysis of false positives can be faster. It's not slow, but it can be faster."

More Microsoft Defender for Office 365 cons

Pricing and Cost Advice

"Cloudflare Zero Trust Platform's pricing is good."

"The prices are slightly expensive."

"The solution is not that expensive."

"My company has to make yearly payments towards the licensing costs attached to the solution. There are no hidden charges apart from the licensing costs of the solution."

"The solution's pricing lacks transparency."

"The pricing of the solution is cheap. The licensing cost is also very low. I rate the cost and pricing a three out of ten."

"The pricing is somewhere in the middle. I would rate the pricing a seven out of ten."

"The price tag is no longer $200,000, but rather $300,000 to $400,000. It's twice."

"The product's licensing part depends on the number of mailboxes and the hard disk needed by customers. The cost of the license depends on the number of mailboxes and the number of emails."

"The solution is reasonably priced compared to one of its competitors."

"The tool is very expensive."

"The fees for Fortinet FortiMail can be complicated. However, overall the pricing is fair."

"There is either an annual or six-month charge to use this solution. Fortinet FortiMail is cheaper than Proofpoint or Cisco Security, or other email security appliances."

"In the future I would like it if there's a possibility to lower the price of the bandwidth and UTM. It is quite expensive."

"If you don't need the full bundle that includes everything, you have options for the small or medium enterprise environments."

"In terms of licensing, we are using a virtual machine license for the single virtual server which it runs on. Doing it this way enables us to cut costs by only licensing FortiMail for our exact use case. If you need to expand in future, you can later buy extra licenses per virtual machine."

More Fortinet FortiMail pricing and cost advice

"The pricing is normal. Considering its popularity, it's not overpriced."

"From the pricing point of view, like any other product in the market, there is scope for negotiation."

"Microsoft Defender is expensive. I typically recommend it only if clients have the budget. Otherwise, I would suggest an alternative."

"For licensing, it's usually a yearly package for customers who are subscribed to Office 365, but they can also pay on a monthly basis."

"It's a user-base subscription."

"Defender for 365 comes in various plans and licenses, along with other Microsoft security solutions. Purchasing this kind of package or security bundle gives good value for money, and that's what I recommend."

"The license is expensive because the cost is based on the number of users."

"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."

More Microsoft Defender for Office 365 pricing and cost advice

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Top Industries

By visitors reading reviews

Construction Company

20%

Comms Service Provider

11%

Financial Services Firm

Manufacturing Company

Computer Software Company

Financial Services Firm

Manufacturing Company

Construction Company

Computer Software Company

12%

Financial Services Firm

Manufacturing Company

Comms Service Provider

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

By reviewers
Company Size	Count
Small Business	10
Midsize Enterprise	2
Large Enterprise	11

By reviewers
Company Size	Count
Small Business	32
Midsize Enterprise	23
Large Enterprise	15

By reviewers
Company Size	Count
Small Business	25
Midsize Enterprise	12
Large Enterprise	31

Questions from the Community

What needs improvement with Cloudflare Access?

Cloudflare Access has strong integration with Microsoft, among other platforms. However, when it comes to Kaspersky, ...

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What is your primary use case for Cloudflare Access?

Cloudflare Access provides secure access to internal applications for employees, external members of the organization...

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What advice do you have for others considering Cloudflare Access?

Cloudflare Access is one of the best integrations available. While about two hundred vendors offer similar services, ...

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What is your experience regarding pricing and costs for Fortinet FortiMail?

The setup cost is a little bit costly.

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What needs improvement with Fortinet FortiMail?

I think they should improve Fortinet FortiMail on-premises by enhancing its user interface. Additional features they ...

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What is your primary use case for Fortinet FortiMail?

I do have a partnership with Fortinet. I have been both a partner and reseller.

See all answers

What is your experience regarding pricing and costs for Microsoft Defender for Office 365?

My experience with pricing, setup, and licensing is that it's actually quite reasonable even on the licensing side as...

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What needs improvement with Microsoft Defender for Office 365?

I think Microsoft Defender for Office 365 can be improved by creating more educational pieces about not just looking ...

See all answers

What is your primary use case for Microsoft Defender for Office 365?

My main use cases for Microsoft Defender for Office 365 include email hygiene.

See all answers

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Product Reports

Buyer's Guide

Cloudflare One

May 2026

Download Cloudflare One product report

Buyer's Guide

Fortinet FortiMail

May 2026

Download Fortinet FortiMail product report

Buyer's Guide

Microsoft Defender for Office 365

April 2026

Microsoft Defender for Office 365 report

Download Microsoft Defender for Office 365 product report

Also Known As

Cloudflare Area 1 Email Security, Cloudflare Bot Management, Cloudflare Gateway, Cloudflare Zero Trust Platform, Cloudflare DDoS, Cloudflare SASE & SSE Platform

FortiMail

MS Defender for Office 365

Overview

Cloudflare One is a comprehensive platform for security, performance, and connectivity. It provides features like rate limiting, DDoS protection, and application access, tailored to enhance user experience while securing internet access and accelerating communications.

Designed to integrate security measures with ease of use and scalability, Cloudflare One offers a secure web gateway and zero trust network access. These features ensure seamless setup and operation, making connectivity reliable and protected. Users appreciate its integrated console, intuitive interface, and the ability to manage risk effectively. It offers straightforward deployment, improves latency, and boasts cost-effectiveness. While its onboarding process and documentation need enhancement, its value in content delivery and application shielding is notable. Despite challenges in integrating Cloudflare Access with existing VPNs and the need for better automation and support, it remains vital for DNS and infrastructure protection.

What features make Cloudflare One stand out?

Rate Limiting: Controls the traffic rate to prevent abuse.
DDoS Protection: Shields applications from distributed denial-of-service attacks.
Secure Web Gateway: Provides secure internet access with seamless operation.
Zero Trust Network Access: Ensures secure, application-based connectivity without relying on traditional VPNs.
Access for Connectivity: Facilitates access to internal applications securely.

What benefits should users look for in reviews?

Security: Robust measures for DNS and browsing protection.
Performance: Enhanced site accessibility and communication speed.
Cost-Effectiveness: Offers competitive pricing for its features.
Ease of Deployment: Straightforward and efficient setup process.

In industries like finance, retail, and technology, Cloudflare One is crucial for enabling secure remote access and protecting web applications against dynamic threats. It supports compliance access policies and enhances content delivery, playing a key role in safeguarding digital infrastructure.

Cloudflare

Fortinet FortiMail is a robust email security platform offering anti-spam, antivirus, and anti-phishing capabilities. It integrates with Fortinet products to ensure seamless protection against email threats in on-premises, cloud, and hybrid environments, enhancing secure communication for businesses.

Fortinet FortiMail is designed to protect against a range of email threats including spam, phishing, and malware, ensuring email safety for organizations. It operates as both a gateway and server, allowing for secure filtering of incoming and outgoing emails. The integration with Fortinet’s suite of security tools provides a comprehensive approach to managing threats effectively, while user-friendly interfaces and detailed reporting systems aid in threat monitoring and management. Frequent updates are implemented, though scalability and web console enhancements are necessary for improved performance.

What are the key features of Fortinet FortiMail?

Anti-Spam: Provides reliable filtering to block unwanted emails.
Antivirus: Ensures protection against harmful viruses.
Anti-Phishing: Prevents phishing attempts through advanced detection.
Sandboxing: Enhances threat detection to manage email security efficiently.
Integration: Seamlessly works with other Fortinet products for unified security.

What benefits should users expect from Fortinet FortiMail?

Comprehensive Security: Offers robust protection against multiple email threats.
Ease of Use: Features a user-friendly interface for better accessibility.
Detailed Reporting: Provides insights into threat management activities.
Reliable Performance: Delivers consistent updates for maintaining email protection.

Fortinet FortiMail is implemented by companies across industries seeking to secure their email communications. In healthcare, it protects sensitive patient information, while in finance, it safeguards transactional data against phishing attacks. Retailers utilize FortiMail to prevent data breaches from fraudulent emails, demonstrating its versatility in diverse sectors.

Fortinet

Microsoft Defender for Office 365 offers real-time email security, enhancing threat detection through integration within the Microsoft ecosystem. Its user-friendly interface and central management streamline operations, providing robust protection against phishing, ransomware, and malware.

Defender for Office 365 is focused on efficiently securing email communication by safeguarding against phishing, malware, and spam threats. With its strong integration with other Microsoft services, it is tailored to improve endpoint security and identity protection. Its centralized management tools simplify threat prioritization, while the automated threat response capabilities ensure swift actions against potential risks. Organizations leverage its capabilities to efficiently manage their cybersecurity efforts, particularly in remote work environments, while maintaining a secure system across Office 365 applications and Azure-hosted services.

What are the key features?

Real-time Email Protection: Continuously monitors and protects email communications.
Safe Attachments and Links: Scans attachments and links for potential threats.
Anti-Phishing Measures: Provides tools to detect and block phishing attempts.
Integration with Microsoft Services: Seamlessly connects with other Microsoft applications for enhanced security.
Automated Threat Responses: Activates immediate responses to detected threats.

What benefits should users expect from reviews?

Time Savings: Automates processes to reduce manual threat management efforts.
Improved Cybersecurity: Strengthens organizational defenses against various cyber threats.
Efficient Remote Work: Enhances protection for remote teams and virtual collaborations.
Comprehensive Coverage: Extends protection across Office 365 and Azure services.

Implementations of Defender for Office 365 vary across industries, optimizing email security for sectors such as finance, healthcare, and education. In finance, it aids in protecting sensitive financial data from phishing and fraud. Healthcare benefits from secure communications, ensuring patient data privacy. Educational institutions use it to maintain secure virtual learning environments against cyber threats.

Microsoft

Sample Customers

23andMe

Magromer Cueros y Pieles S.A.

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.

Buyer's Guide

Fortinet FortiMail vs. Microsoft Defender for Office 365

April 2026

Free Report: Fortinet FortiMail vs. Microsoft Defender for Office 365

Find out what your peers are saying about Fortinet FortiMail vs. Microsoft Defender for Office 365 and other solutions. Updated: April 2026.

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