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Microsoft Exchange Online Protection (EOP) vs Mimecast Email Security 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
6.4
Microsoft Exchange Online Protection offers cost-effective email security, reducing incidents and boosting productivity over competitors like Trend and AppRiver.
Sentiment score
6.0
Mimecast Email Security effectively prevents phishing, enhancing security and providing significant protection despite challenges in quantifying ROI.
There is definitely a return on investment when using Mimecast, as it blocks phishing emails, reducing the risk of significant financial losses.
 

Customer Service

Sentiment score
6.3
Microsoft Exchange Online Protection customer service is praised for availability but criticized for inconsistent response quality and speed.
Sentiment score
6.0
Mimecast Email Security's customer service is mixed, with responsiveness praised by some, but issues with waiting times noted by others.
Microsoft offers excellent 24/7 support.
My team is able to get the help they need when necessary.
Support personnel are hesitant to engage in remote sessions, preferring to share documentation via email.
Mimecast technical support is generally quite good.
I would rate my experience with technical support of Mimecast Email Security between seven and eight out of ten for their support.
 

Scalability Issues

Sentiment score
7.8
Microsoft Exchange Online Protection offers scalable security solutions despite some limitations, appreciated for ease of use and high satisfaction.
Sentiment score
7.2
Mimecast Email Security is a scalable SaaS solution, praised for flexibility and effectiveness across various organization sizes and industries.
If Mimecast Email Security introduces API solutions, it will dominate the market.
 

Stability Issues

Sentiment score
7.7
Microsoft Exchange Online Protection is reliable, scoring high in stability, with issues mainly from configuration and occasional interface changes.
Sentiment score
7.5
Mimecast Email Security is generally stable and reliable, with rare bugs, occasional minor issues, and minimal downtime reported.
They confirm it's a good solution where only one or two rare emails get through, while the rest are properly blocked without any issues.
 

Room For Improvement

Microsoft Exchange Online Protection needs better integration, enhanced security features, improved user experience, and competitive pricing for increased effectiveness.
Mimecast Email Security requires pricing, detection, user interface improvements, better support, and enhanced AI integration for smoother operations.
The user interface of Microsoft Exchange Online Protection (EOP) has room for improvement.
Improving the search process by allowing searches with different types of parameters and facilitating searches within emails would be advantageous.
A lot of emails were missed despite being known samples.
Mimecast Email Security can be improved by adding some API integrations.
We discussed the phishing aspect, the DNS system, and the key rotation.
 

Setup Cost

Microsoft Exchange Online Protection offers tiered pricing, seen as high but justified by robust security and scalability features.
Mimecast Email Security offers comprehensive features but is considered premium, with variable pricing flexibility and additional support costs.
The pricing is reasonable.
Microsoft Exchange is more expensive compared to other services like Gmail.
I find the price of Microsoft Exchange Online Protection (EOP) to be fairly reasonable, and I have no problems with it.
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
 

Valuable Features

Microsoft Exchange Online Protection offers scalable, user-friendly security features with AI-enhanced threat management and seamless integration with Microsoft tools.
Mimecast Email Security offers strong threat protection, seamless Microsoft 365 integration, and user-friendly features for comprehensive email threat mitigation.
We've benefited from the anti-phishing features of Microsoft Exchange Online Protection (EOP), as it has been quite accurate and has eliminated most of our phishing emails, making it really impressive.
It offers more features and better security, making it the best option for corporate environments.
In the last three years, has resulted in no antivirus problems.
One of the most useful features is the threat remediation module, which can be used to remove malicious emails that may have been delivered or manually remove them.
Mimecast Email Security includes the best gateway solution across all Cisco, Trend Micro, and other solutions.
A distinct advantage of Mimecast is its ability to block phishing and impostor attacks, which are significant threats currently.
 

Categories and Ranking

Microsoft Exchange Online P...
Average Rating
8.2
Reviews Sentiment
6.7
Number of Reviews
41
Ranking in other categories
Email Security (6th), Anti-Malware Tools (8th)
Mimecast Email Security
Average Rating
8.0
Reviews Sentiment
6.1
Number of Reviews
32
Ranking in other categories
Office 365 Protection (3rd), Secure Email Gateway (SEG) (4th)
 

Mindshare comparison

While both are Messaging and Collaboration solutions, they serve different purposes. Microsoft Exchange Online Protection (EOP) is designed for Anti-Malware Tools and holds a mindshare of 1.3%, down 1.8% compared to last year.
Mimecast Email Security, on the other hand, focuses on Secure Email Gateway (SEG), holds 12.6% mindshare, down 15.4% since last year.
Anti-Malware Tools Market Share Distribution
ProductMarket Share (%)
Microsoft Exchange Online Protection (EOP)1.3%
Microsoft Defender for Endpoint14.2%
F-Secure Total6.1%
Other78.4%
Anti-Malware Tools
Secure Email Gateway (SEG) Market Share Distribution
ProductMarket Share (%)
Mimecast Email Security12.6%
Microsoft Defender for Office 36527.5%
Proofpoint Email Protection21.0%
Other38.9%
Secure Email Gateway (SEG)
 

Featured Reviews

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.
ShaheenKapery - PeerSpot reviewer
Provides valuable security features and has a straightforward setup process
The initial setup process is straightforward and takes a weekend at most. A .com domain can take up to forty-eight hours, while a local domain takes about four to eight hours because it has to propagate through the international DNS records. It is a cloud-only solution. If you're managing email security on-premises, you use your bandwidth to download emails, including spam, and then use your servers to clean it up. For example, say a third of your email is spam; this consumes significant bandwidth and resources. However, if you use Mimecast, they filter the emails on their servers before delivering them to you. It can be a major selling point in regions with expensive bandwidth, such as Africa. You can save bandwidth and improve overall efficiency by offloading the spam filtering to Mimecast.
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Top Industries

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

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business24
Midsize Enterprise7
Large Enterprise10
By reviewers
Company SizeCount
Small Business16
Midsize Enterprise7
Large Enterprise11
 

Questions from the Community

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?
Besides price, the main room for improvement includes the sandbox or something similar; the usability that solutions are focused on. I have not really utilized its anti-phishing features because th...
What is your primary use case for Microsoft Exchange Online Protection?
I'm reviewing different solutions because I work for a consulting company, and we are dealing with a review. We use Peer review for that to find some information, which is very useful. I am certifi...
What do you like most about Mimecast Email Security with Targeted Threat Protection?
The interface of this solution is very easy to navigate and user-friendly. There is no delivery in email and other communications, making it reliable. The configuration is relatively easy.
What needs improvement with Mimecast Email Security with Targeted Threat Protection?
If I ask you about the room for improvement, we discussed the phishing aspect, the DNS system, and the key rotation. Apart from that, are there any other areas that you would like to see improved o...
 

Also Known As

Microsoft EOP, MS Exchange Online Protection
Mimecast Email Security with Targeted Threat Protection
 

Overview

 

Sample Customers

Information Not Available
Azizi Developments, Affinity Credit Union, Aftercare, Al Abbar Group
Find out what your peers are saying about Microsoft Exchange Online Protection (EOP) vs. Mimecast Email Security and other solutions. Updated: January 2024.
867,445 professionals have used our research since 2012.