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Abnormal Security vs Microsoft Defender for Office 365 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

Abnormal Security
Ranking in Email Security
2nd
Ranking in Secure Email Gateway (SEG)
2nd
Average Rating
9.6
Reviews Sentiment
7.9
Number of Reviews
10
Ranking in other categories
No ranking in other categories
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)
 

Mindshare comparison

As of September 2025, in the Email Security category, the mindshare of Abnormal Security is 7.0%, up from 5.0% compared to the previous year. The mindshare of Microsoft Defender for Office 365 is 11.5%, down from 15.4% 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 36511.5%
Abnormal Security7.0%
Other81.5%
Email Security
 

Featured Reviews

ChrisBrown5 - PeerSpot reviewer
Automated threat detection that protects against corruption with minimal intervention
Abnormal Security is valuable because it features an automated scoring tool that doesn't require much intervention from our team. It enhances threat detection capabilities by making the process automated and is easy to scale to our entire environment. Additionally, it protects us from being business email compromised, which is invaluable for maintaining our security.
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.

Quotes from Members

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

Pros

"It does some really cool stuff that other tools aren't doing. We found it to be really effective, and the AI/ML functionality is really what differentiates them."
"One of the things that I love about them is that the setup and installation are super easy. All you do is give them access to your Microsoft 365 tenant, and through APIs, they are able to do their work. They are doing all this through APIs, so you do not have to install the software and take a month to get it all set up to even see the value of the solution. You could be up and running in less than an hour."
"The features that appeal to me most are the combination of auto-remediation and Detection 360."
"I would recommend Abnormal Security."
"I have never encountered any stability issues with Abnormal."
"Ease of use is undoubtedly one of the most valuable features of Abnormal Security."
"It protects us from being business email compromised, which is invaluable for maintaining our security."
"I like Abnormal's threat protection with auto-remediation, but I also love its abuse mailbox feature, which automatically responds to the end user. That feature has a super-valuable security component and helps improve the user experience."
"There are several features that I consider valuable."
"The DLP feature of Microsoft Defender for Office 365 is valuable, and we also use the DLP feature for email real-time detection."
"Since we have started using the solution, there have been fewer compromises."
"It gives us visibility into threats and, for endpoints, it helps us to prioritize threats. We used to have a lack of visibility, but now our time to detect and respond has decreased."
"It’s easy to handle integrations, and we don't need a lot of people in our IT team."
"At the moment we are satisfied with this product. It's a stable, scalable, and resilient solution for us."
"I would say that 90% of the spam and phishing attack emails get blocked right off the bat."
"The most valuable feature is the integration. It's a single console, so we don't have to switch around between multiple products. Another valuable feature is the ease of operations and maintenance."
 

Cons

"There could be more selectable options and more granular selections available."
"The ideal scenario would be for Abnormal Security to work in tandem with Microsoft to analyze incoming emails."
"One feature I'd love to see is outbound scanning."
"The biggest pain point for us is the lack of support for on-premise email systems."
"There could be room for improvement in enhancing integration with other cybersecurity tools."
"When we're working on something as engineers, and we find an idea or a method of doing something that would be greatly improved by doing it another way, there should be an ability for me to click the ideas button, type in an idea that I have, and submit it to a product review team or developers to have them think through the process a little bit more."
"There could be more selectable options and more granular selections available."
"I would like to have the ability to customize the auto-remediation feature."
"Microsoft Defender for Office 365 must improve the overall management style, including the GUI. It also needs to change the filters so that it is easy to whitelist and blacklist data."
"There is a different console for different things; I just want one consolidated console."
"In some situations, it has not been able to pick impersonated emails having no attachments. Technical support definitely has a scope for improvement."
"I am generally satisfied with how it currently is. If I could improve anything, I would reduce the cost."
"The only thing they should improve is the licensing model. They should stop changing it. A year ago, the five features I mentioned were included in one product. Now, three of them are bundled into one product, and you have to pay extra for the other two. I don't mind paying extra, but I don't want them to change it every year or every six months. I need to know what I'm looking at and not worry about it next year."
"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."
"Specifically, within Microsoft Defender for Office 365, I want it to improve the DLP capabilities."
"Several simulation options are available within 365, and the phishing simulation could be better."
 

Pricing and Cost Advice

"The license is based on the user count, so the number of users that have an email address in the organization."
"The pricing appears fair, and they demonstrate a genuine willingness to work with us on it."
"Abnormal Security, on the other hand, provides the same level of functionality for just over $60,000 – that's half the price!"
"Overall, we'd certainly prefer lower pricing, but Abnormal Security doesn't seem unreasonable compared to similar offerings in the market."
"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."
"It's a user-base subscription."
"I know that the product is incredibly expensive."
"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."
"The pricing has become expensive."
"The pricing is normal. Considering its popularity, it's not overpriced."
"Compared to other brands, Microsoft Defender for Office 365's pricing is competitive."
"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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Top Industries

By visitors reading reviews
Computer Software Company
14%
Financial Services Firm
9%
Manufacturing Company
7%
Government
7%
Computer Software Company
15%
Financial Services Firm
8%
Manufacturing Company
8%
Comms Service Provider
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Midsize Enterprise2
Large Enterprise8
By reviewers
Company SizeCount
Small Business23
Midsize Enterprise8
Large Enterprise27
 

Questions from the Community

What do you like most about Abnormal Security?
The features that appeal to me most are the combination of auto-remediation and Detection 360.
What is your experience regarding pricing and costs for Abnormal Security?
I find the pricing to be favorable, but I did not disclose the exact cost.
What needs improvement with Abnormal Security?
There could be more selectable options and more granular selections available.
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...
 

Also Known As

No data available
MS Defender for Office 365
 

Overview

 

Sample Customers

Foot Lcoker, Xerox, Liberty Mutual, Mattel, Boston Scientific
Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Find out what your peers are saying about Abnormal Security vs. Microsoft Defender for Office 365 and other solutions. Updated: August 2025.
867,349 professionals have used our research since 2012.