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Microsoft Defender for Office 365 vs Microsoft Exchange Online Protection (EOP) comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Jul 27, 2025

Review summaries and opinions

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

ROI

Sentiment score
7.3
Microsoft Defender for Office 365 is praised for enhancing security, reducing costs, and improving productivity with integrated threat protection.
Sentiment score
7.0
Microsoft Exchange Online Protection offers cost-effective email security, reducing incidents and boosting productivity over competitors like Trend and AppRiver.
It has also decreased our time to detection and response by about 15 to 20 percent.
Overall, cost of owning and operating our system goes down.
In terms of the areas where I saw that return on investment with Microsoft Defender for Office 365, it is related to the risk to our environment, specifically regarding users being scammed or phished.
 

Customer Service

Sentiment score
6.0
Microsoft Defender for Office 365 support is mixed, praised for responsiveness but criticized for delays and outdated documentation.
Sentiment score
6.3
Microsoft Exchange Online Protection customer service is praised for availability but criticized for inconsistent response quality and speed.
Over the past two years, there have been no critical problems.
we opened tickets, and they typically resolve them quickly.
My experience with customer support and technical support for Microsoft Defender for Office 365 has been excellent.
Microsoft offers excellent 24/7 support.
My team is able to get the help they need when necessary.
 

Scalability Issues

Sentiment score
8.0
Microsoft Defender for Office 365 seamlessly scales for global users, enabling effective cybersecurity with adaptable cloud-based capabilities and careful planning.
Sentiment score
7.8
Microsoft Exchange Online Protection offers scalable security solutions despite some limitations, appreciated for ease of use and high satisfaction.
We have never faced scalability problems, and Microsoft manages it effectively.
Microsoft Defender for Office 365 scales transparently for us, as we grew from 1,000 users to 3,000 users, and we didn't notice much difference.
 

Stability Issues

Sentiment score
7.5
Microsoft Defender for Office 365 is praised for its stability, reliability, operational effectiveness, and high user satisfaction despite minor issues.
Sentiment score
7.7
Microsoft Exchange Online Protection is reliable, scoring high in stability, with issues mainly from configuration and occasional interface changes.
I would assess the stability and reliability of Microsoft Defender for Office 365 as very stable, with barely any issues.
The solution is stable, as we have been using it for the past two years.
Overall, the stability and reliability of Microsoft Defender for Office 365 are good.
 

Room For Improvement

Microsoft Defender for Office 365 needs better virus blocking, integration, threat detection, user-friendly configuration, and competitive pricing improvements.
Microsoft Exchange Online Protection needs better integration, enhanced security features, improved user experience, and competitive pricing for increased effectiveness.
Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published.
There is a different console for different things; I just want one consolidated console.
The main area for improvement is simplifying the implementation and rollout process.
Improving the search process by allowing searches with different types of parameters and facilitating searches within emails would be advantageous.
 

Setup Cost

Microsoft Defender for Office 365 offers comprehensive security, valued for integration with E3/E5 licenses, despite varied perceptions on cost.
Microsoft Exchange Online Protection offers tiered pricing, seen as high but justified by robust security and scalability features.
We've likely saved 30% of costs.
Microsoft is quite affordable with a lot of features available for any size organization.
Money-wise, it is a part of the Office 365 suite, making it slightly more expensive compared to Trend Micro.
The pricing is reasonable.
Microsoft Exchange is more expensive compared to other services like Gmail.
 

Valuable Features

Microsoft Defender for Office 365 provides comprehensive security features, enhancing protection and efficiency across platforms with real-time threat detection.
Microsoft Exchange Online Protection offers scalable, user-friendly security features with AI-enhanced threat management and seamless integration with Microsoft tools.
The value of the DLP feature is significant to us because we have internal data, sometimes sensitive, and the users may not always be aware of security and privacy, which might lead them to send out information mistakenly to external parties.
It provides end-to-end visibility on email threats such as phishing, extending beyond Exchange Online Protection.
It ranks the threats and allows us to prioritize those hitting us the hardest, such as email threats.
The security features provided by Microsoft are robust.
In the last three years, has resulted in no antivirus problems.
It offers more features and better security, making it the best option for corporate environments.
 

Categories and Ranking

Microsoft Defender for Offi...
Ranking in Email Security
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), Secure Email Gateway (SEG) (1st)
Microsoft Exchange Online P...
Ranking in Email Security
6th
Average Rating
8.2
Reviews Sentiment
6.8
Number of Reviews
40
Ranking in other categories
Anti-Malware Tools (9th)
 

Mindshare comparison

As of August 2025, in the Email Security category, the mindshare of Microsoft Defender for Office 365 is 12.1%, down from 16.1% compared to the previous year. The mindshare of Microsoft Exchange Online Protection (EOP) is 6.0%, down from 8.6% compared to the previous year. It is calculated based on PeerSpot user engagement data.
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.
Amber Worth - PeerSpot reviewer
Retrieves data from quarantines and easy to read logs with robust security features
Some of the searchability when looking for specifics in Exchange logs is tedious. Although eventually the information is located, it can be difficult if detailed information is lacking. Improving the search process by allowing searches with different types of parameters and facilitating searches within emails would be advantageous. Simplifying interfaces would also be appreciated.
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Top Industries

By visitors reading reviews
Computer Software Company
16%
Financial Services Firm
8%
Manufacturing Company
8%
Comms Service Provider
6%
Computer Software Company
14%
Financial Services Firm
9%
Government
8%
Manufacturing Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

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?
Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published. It's essential to enhan...
What do you like most about Microsoft Exchange Online Protection?
The initial setup was easy. The configuration process is very straightforward.
What needs improvement with Microsoft Exchange Online Protection?
Reporting could be one of the areas for improvement, as they could put more reporting into Microsoft Exchange Online Protection (EOP) natively rather than requiring additional licensing or connecti...
What is your primary use case for Microsoft Exchange Online Protection?
The company does work with this technology, but not me personally. I manage some other products currently, mainly in the modern workplace space, such as Azure Virtual Desktop and Microsoft 365. I d...
 

Also Known As

MS Defender for Office 365
Microsoft EOP, MS Exchange Online Protection
 

Overview

 

Sample Customers

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Information Not Available
Find out what your peers are saying about Microsoft Defender for Office 365 vs. Microsoft Exchange Online Protection (EOP) and other solutions. Updated: July 2025.
865,295 professionals have used our research since 2012.