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MetaDefender Email Gateway Security vs Microsoft Defender for Office 365 comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Oct 6, 2026

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

MetaDefender Email Gateway ...
Ranking in Email Security
32nd
Ranking in Secure Email Gateway (SEG)
13th
Average Rating
8.4
Reviews Sentiment
6.9
Number of Reviews
3
Ranking in other categories
No ranking in other categories
Microsoft Defender for Offi...
Ranking in Email Security
2nd
Ranking in Secure Email Gateway (SEG)
2nd
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
61
Ranking in other categories
Email Archiving (2nd), Advanced Threat Protection (ATP) (3rd), Microsoft Security Suite (9th)
 

Mindshare comparison

As of October 2026, in the Email Security category, the mindshare of MetaDefender Email Gateway Security is 1.0%, up from 0.4% compared to the previous year. The mindshare of Microsoft Defender for Office 365 is 5.1%, down from 11.0% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Security Mindshare Distribution
ProductMindshare (%)
Microsoft Defender for Office 3655.1%
MetaDefender Email Security Solutions1.0%
Other93.9%
Email Security
 

Featured Reviews

RM
Senior Information Systems Engineer at Liberty Pumps, Inc.
Helpful support, and useful dashboards
They offer a feature called SmartLink neutralization. I have tried it before. It seemed to work most of the time; however, I had a few users for whom it just wouldn't work. Whenever they click on a link, it stays on the MetaDefender page, saying that it's scanning it and never moves forward. I haven't tried it in a while since then. Since I can't turn it off on a per-user basis, I had to turn it off globally. I have certain exceptions for not doing the sanitization, and how to set those up is not intuitive. It would be useful if there were a better way of doing that. Using digital certificates is hard. It would be better if it used Windows Servers' built-in certificate management.
Emeka Ndulu - PeerSpot reviewer
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.

Quotes from Members

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

Pros

"The most valuable feature is called summary reconstruction which is used to deliver encrypted files to users."
"The sanitization is very good."
"The most valuable feature of MetaDefender Email Security is the CDR. Customers purchase this solution specifically for data communication, as the other features can be obtained through other technologies that most customers already possess. Therefore, data communication serves as the foundation for the platform."
"The most valuable feature of Microsoft Defender for Office 365 is data backups that we can provide through ticket requests."
"We use Microsoft Defender for its ability to integrate with existing business technologies, which is beneficial for protecting business areas."
"It has helped us in improving our security posture; it detects any kind of attack or abnormal behavior in accessing the system and sends an alert to the administrator who can check, understand, and review on time to ensure that all activities are legit."
"Microsoft Defender for Office 365 is a stable solution."
"My experience deploying Microsoft Defender for Office 365 was seamless."
"One of the best features of the tool is its capability to aggregate insights from different workloads, basically from the Office 365 and endpoints part."
"The initial setup was easy."
"Defender is a SaaS platform, so it offers more flexibility. Managing the permissions is easier. The solution's automated detection and response features are scalable."
 

Cons

"They offer a feature called SmartLink neutralization. I have tried it before. It seemed to work most of the time; however, I had a few users for whom it just wouldn't work. Whenever they click on a link, it stays on the MetaDefender page, saying that it's scanning it and never moves forward."
"Although the number of AV engines is good, it could be better."
"The DLP should be upgraded and has room for improvement."
"From a development point of view, if I wanted to do development on my actual machine where Defender is, the organization can set certain policies or Defender makes that prohibitive."
"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."
"The inbuilt analysis of false positives can be faster. It's not slow, but it can be faster."
"We are always looking for others tools to increase automation on tasks. There can be better integration with other solutions, such as PowerPoint and email."
"The XDR dashboard has room for improvement."
"Too many false positives and lacks an accurate capability to detect malicious SharePoint sites."
"Microsoft Defender for Office 365 is not up to the mark in comparison with Wiz or Palo Alto."
"The UI needs to be more user-friendly."
 

Pricing and Cost Advice

"According to our customers, the price of MetaDefender is high and it continues to increase by almost 15 percent each year."
"I know that the product is incredibly expensive."
"The license is expensive because the cost is based on the number of users."
"The pricing has become expensive."
"Microsoft Defender for Office 365 is an add-on to the Office license. Many customers are purchasing this solution."
"Microsoft Defender is expensive. I typically recommend it only if clients have the budget. Otherwise, I would suggest an alternative."
"While Microsoft Defender for Office 365 necessitates pricier E3 or E5 subscriptions, the extensive functionality offered by these licenses across various Microsoft products justifies the investment."
"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."
"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."
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916,956 professionals have used our research since 2012.
 

Top Industries

By visitors reading reviews
Construction Company
13%
Comms Service Provider
10%
Outsourcing Company
10%
Pharma/Biotech Company
6%
Computer Software Company
11%
Manufacturing Company
10%
Financial Services Firm
8%
Comms Service Provider
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business24
Midsize Enterprise11
Large Enterprise32
 

Questions from the Community

Ask a question
Earn 20 points
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 a standalone product. It's very competitive compared to what competitors are ch...
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 for malware. We are seeing a lot more malware-less emails that Defender for Offi...
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.
 

Also Known As

OPSWAT MetaDefender Email Security, MetaDefender Email Gateway Security, MetaDefender Email Security
MS Defender for Office 365
 

Overview

 

Sample Customers

https://www.opswat.com/blog/how-one-of-the-largest-banks-in-taiwan-uses-opswat-metadefender-email-security-to-close-security-gaps https://www.opswat.com/blog/hapool-insurance-achieves-almost-100-reduction-in-email-threats-with-opswat https://www.opswat.com/blog/luzerner-psychiatrie-ag-stops-email-borne-malware-attacks-with-opswat-technology
Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Find out what your peers are saying about MetaDefender Email Gateway Security vs. Microsoft Defender for Office 365 and other solutions. Updated: September 2026.
916,956 professionals have used our research since 2012.