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Abnormal Security vs Microsoft Defender for Office 365 comparison

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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
12th
Ranking in Secure Email Gateway (SEG)
6th
Average Rating
9.4
Reviews Sentiment
7.5
Number of Reviews
11
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 Abnormal Security is 3.2%, down from 6.5% 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%
Abnormal Security3.2%
Other91.7%
Email Security
 

Featured Reviews

reviewer2251509 - PeerSpot reviewer
Senior Director, Information Technology at a insurance company with 51-200 employees
AI has helped classify threat types more accurately but product ownership can improve
Ease of use is important, and Abnormal Security's responsiveness and ability to deliver solutions when issues arise are crucial. However, there is always room for improvement, as achieving a perfect 10 means there is no more room for enhancement. For Abnormal Security, it's about leveraging AI even more, which they are already working on in their roadmap.
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

"Their ability to take things out of the mailbox and catch things much faster than users is excellent."
"What I like about Abnormal Security is that it notifies me if any of my partners or suppliers are experiencing a security breach by analyzing their database and identifying potential cyber threats."
"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."
"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."
"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."
"I would recommend Abnormal Security."
"The features that appeal to me most are the combination of auto-remediation and Detection 360."
"Initial auto-remediation allows us to auto-remediate before the email lands in the end user's inbox for a split second."
"Microsoft Defender for Office 365 saves me time; it does save a lot of time, especially with the automation."
"It also gives me good visibility because, with Defender, I'm using a Microsoft product to defend Microsoft products. The integration was really seamless and I have wide visibility because it picks up almost everything. Literally, I can see almost every activity that happens, from the e-mail to the workstation itself."
"The most valuable feature of Microsoft Defender for Office 365 is its spam filter."
"My experience deploying Microsoft Defender for Office 365 was seamless."
"Microsoft Defender for Office 365 helps people to work remotely. It is a secure solution. We don't need to use our company's computers or get VPN connections to the networks. I can control how they share screens and what they send to the devices. It keeps our organizations confidential and sensitive information safe."
"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."
"The most valuable aspect of Microsoft Defender for Office 365 is its ability to protect us from malware."
"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."
 

Cons

"There could be more selectable options and more granular selections available."
"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."
"I would like to have the ability to customize the auto-remediation feature."
"One feature I'd love to see is outbound scanning."
"I, as such, do not have anything that I do not like or would like to add, but you could argue that because they are doing it API-based, there is a chance that something could slip through temporarily before they are able to pull it out. In theory, it could happen just because of the nature of the system. They are not in line with the delivery of the mail. They are kind of asynchronous, which is a pro as well as a con. If it is synchronous, then I know it would always stop them, but because it is asynchronous, things could get through temporarily or because of some system issues on the Microsoft side or their side. It is the nature of the beast, but it is a little bit of a con."
"Abnormal should add more automatic reports. I have an open request to our account team for more notification and report types that can be sent automatically. For example, they have an awesome report that gets sent weekly, and I also want them monthly, so I don't need to do so much adding up when my director wants numbers over time."
"There could be room for improvement in enhancing integration with other cybersecurity tools."
"The biggest pain point for us is the lack of support for on-premise email systems."
"Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published."
"I am generally satisfied with how it currently is. If I could improve anything, I would reduce the cost."
"Microsoft Defender for Office 365 should improve the troubleshooting tools. It's unclear whether the device is blocked at the firewall level or at the device itself. The granularity needed for troubleshooting is currently lacking. From my perspective, Microsoft should address this issue to benefit many users who likely share the same sentiment."
"I think Microsoft Defender for Office 365 can be improved by creating more educational pieces about not just looking for malware."
"Microsoft needs to broaden its global support presence by establishing teams of subject-matter experts in all regions."
"Sometimes, phishing emails manage to pass through the filter, so the system needs to enhance its phishing email detection capabilities."
"Microsoft security solutions work as expected. They are constantly updating the solutions to make them better. At the same time, the changes can impact a customer's environment, and we need to adjust settings. Sometimes we aren't aware of the changes, and nothing is pushed from the backend automatically."
"We need to be able to whitelist data at the backend."
 

Pricing and Cost Advice

"Overall, we'd certainly prefer lower pricing, but Abnormal Security doesn't seem unreasonable compared to similar offerings in the market."
"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!"
"The license is based on the user count, so the number of users that have an email address in the organization."
"For large enterprise organizations, they can definitely afford it, but for small and medium organizations, they might struggle to cover the expenses."
"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."
"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."
"The product is expensive."
"Compared to other brands, Microsoft Defender for Office 365's pricing is competitive."
"From the pricing point of view, like any other product in the market, there is scope for negotiation."
"The pricing is normal. Considering its popularity, it's not overpriced."
"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."
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917,433 professionals have used our research since 2012.
 

Top Industries

By visitors reading reviews
Manufacturing Company
10%
Financial Services Firm
9%
Computer Software Company
8%
Government
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
By reviewers
Company SizeCount
Small Business1
Midsize Enterprise2
Large Enterprise8
By reviewers
Company SizeCount
Small Business24
Midsize Enterprise11
Large Enterprise32
 

Questions from the Community

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?
Ease of use is important, and Abnormal Security's responsiveness and ability to deliver solutions when issues arise are crucial. However, there is always room for improvement, as achieving a perfec...
What is your primary use case for Abnormal Security?
The main use case for Abnormal Security is as a spam filter and for mail hygiene. This use case is for the finance industry.
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

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: September 2026.
917,433 professionals have used our research since 2012.