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Microsoft Defender for Office 365 vs Trellix Collaboration Security comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Dec 3, 2024

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

Microsoft Defender for Offi...
Ranking in Email Security
1st
Ranking in Secure Email Gateway (SEG)
1st
Average Rating
8.4
Reviews Sentiment
6.9
Number of Reviews
53
Ranking in other categories
Email Archiving (1st), Advanced Threat Protection (ATP) (2nd), Microsoft Security Suite (10th)
Trellix Collaboration Security
Ranking in Email Security
18th
Ranking in Secure Email Gateway (SEG)
8th
Average Rating
8.6
Reviews Sentiment
7.0
Number of Reviews
15
Ranking in other categories
Instant Communications Security and Compliance (4th)
 

Mindshare comparison

As of October 2025, in the Email Security category, the mindshare of Microsoft Defender for Office 365 is 11.4%, down from 14.8% compared to the previous year. The mindshare of Trellix Collaboration Security is 1.8%, down from 2.2% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Security Market Share Distribution
ProductMarket Share (%)
Microsoft Defender for Office 36511.4%
Trellix Collaboration Security1.8%
Other86.8%
Email Security
 

Featured Reviews

Tolu Omolaja - PeerSpot reviewer
Great URL scanning and attachment scanning, but I would like more proactive threat analysis
The two main features that prove most beneficial for us are URL scanning and attachment scanning. URL scanning involves an automatic scan of links and emails. When a user clicks on a link within an email, the system promptly checks the link's safety. If the link is deemed safe, access is granted automatically. However, if it is flagged as unsafe, we receive feedback and notification to caution us about the potentially harmful link. At this point, we are presented with the option to proceed or return. I have personally witnessed the system identify a few unsafe links, making this the primary advantage of using the solution. The second crucial aspect is the scanning of attachments. When an email containing an attachment arrives, we receive a notification of the new email, along with information that the attachment is being scanned for threats. This additional layer of security provides peace of mind for our organization. While Microsoft Defender for Office 365 offers numerous features, these two stand out as particularly impressive and valuable to us.
BernardLugalia - PeerSpot reviewer
Provides strong data protection with virtual patching and vulnerability assessments
I primarily use it to monitor database access, particularly in banking and similar environments. It ensures that IT personnel and others do not create unauthorized accounts or users. Collaboration security assists in tracking database access and alerts in case of suspicious activity One of the…

Quotes from Members

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

Pros

"Some of the valuable features on the email side are anti-phishing, anti-malware, and Safe Links."
"Defender for Office 365 has helped eliminate having to look at multiple dashboards and that is the aspect I like most about it. It is simpler, effective, and convenient. The users like the process efficiency."
"Safe attachments, safe links, policies, and the ability to protect from zero-day threats are the most valuable features."
"The initial setup is straightforward. You just add the license, click it, and then you can set up the rules. It is quite simple."
"Scalability-wise, I do not think there are any issues so far."
"The product is not resource-intensive."
"Microsoft Defender for Office 365 is a stable solution."
"The good part is that you don't have to configure it, which is very convenient."
"The product protects my email."
"FireEye Email Security helps us prevent spam and phishing emails and all other business-compromised email attacks."
"The initial setup is simple."
"One of the most valuable features is the protection against vulnerabilities, particularly through virtual patching."
"The auto-remediation feature is valuable."
"Before installing, consider potential challenges with system performance, especially when integrating multiple tools, which could slow down performance."
"What I find most valuable with the solution is that it can integrate with cloud solutions, such as Google and Microsoft. Additionally, the solution is easy to use."
"We have had very good results from the use of FireEye Email Security. We are very comfortable with this technology, but I don't know if it's necessary to move into the cloud, we will check other technologies and study them. Additionally, the solution has good integration."
 

Cons

"There is room for improvement in terms of reporting."
"The certification training for Defender for 365 needs to be deeper and incorporate Sentinel. I took all the security courses except one, and Sentinel isn't included."
"It would be better if it were more scalable. It depends on the architecture, but we would like to make it more scalable for both data centers."
"They have moved features from one console to another. Things have been moved around in the interface and it takes me time to find where certain features are."
"Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published."
"You should be able to deploy Defender for every subscription without the need to add servers."
"Configuration at the mid-level could be improved for the support team."
"In one of the reports I can get the exact place where a vulnerable file resides. But for that, I need to explicitly go into the device and check. If they could include that file part in the report, without my having to go to the device itself, that would help."
"The solution needs better support."
"The spam detection feature could be better."
"Sometimes, integration can be challenging, impacting its stability, which is why I rate it a five out of ten."
"FireEye needs single sign-on. They say it's on their roadmap. They should also implement support for Microsoft Authenticator app for 2FA."
"There is a need for improved integration with totally different products, such as a rapid server."
"I would rate them as a 1.5. The new hub created in India is not good."
"The solution must provide features to scan QR codes for threats."
"In general, our company should make the tool more robust to protect our systems."
 

Pricing and Cost Advice

"The pricing has become expensive."
"Defender is a little bit more expensive as compared to others. We are in the manufacturing environment. So, we don't have a high budget for all of our endpoint devices. Its cost is a major concern for us."
"It's a user-base subscription."
"Compared to other brands, Microsoft Defender for Office 365's pricing is competitive."
"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."
"The solution could be better by simplifying the business model of their licensing. It was hard to figure out how to get the licensing done for the environment, initially."
"The product is very expensive."
"From the pricing point of view, like any other product in the market, there is scope for negotiation."
"The cost is very high."
"The solution requires a license to be purchased for every user."
"The licensing is on a yearly basis."
"I rate the product price as nine out of ten, where ten is the most expensive, and one is the cheapest. There is no need to pay any extra charges apart from the licensing costs."
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Top Industries

By visitors reading reviews
Computer Software Company
15%
Financial Services Firm
8%
Manufacturing Company
8%
Comms Service Provider
6%
Manufacturing Company
18%
Comms Service Provider
11%
Computer Software Company
10%
Government
9%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business23
Midsize Enterprise8
Large Enterprise27
By reviewers
Company SizeCount
Small Business6
Midsize Enterprise4
Large Enterprise5
 

Questions from the Community

What do you like most about Microsoft Defender for Office 365?
Threat Explorer is an invaluable tool for me, and it plays a crucial role in helping me discern the origins of various email campaigns, pinpointing where they emanate from, and identifying the indi...
What is your experience regarding pricing and costs for Microsoft Defender for Office 365?
Microsoft is quite affordable with a lot of features available for any size organization.
What needs improvement with Microsoft Defender for Office 365?
I think that Microsoft Defender for Office 365 could be improved if it could use VirusTotal to compare the programs or anything that I download. VirusTotal helps to identify viruses, malware, troja...
What do you like most about FireEye Email Security?
One of the valuable features of the product stems from the fact that it is easy to implement the tool in our environment.
What needs improvement with FireEye Email Security?
I would like to see the addition of email digital protection features, such as anti-spam and antivirus, not just sandboxing, in the on-premises solution.
What is your primary use case for FireEye Email Security?
I have worked on Email Security ( /categories/email-security ) both on-premises and in the cloud, Web Security, and also on MDR, which is called HX endpoint security for Trellix Collaboration Secur...
 

Also Known As

MS Defender for Office 365
FireEye Email Security
 

Overview

 

Sample Customers

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Northshore Utility District, Luz Technologies, Air Academy Federal Credit Union, Bank Gutmann, Bank of Thailand, Penn State Health Milton S. Hershey Medical Center, State of Missouri, City and County of San Francisco, Denver Public Schools, Vodafone, Go Auto, Stater Bros. Market
Find out what your peers are saying about Microsoft Defender for Office 365 vs. Trellix Collaboration Security and other solutions. Updated: September 2025.
870,623 professionals have used our research since 2012.