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Microsoft Exchange Online Protection (EOP) vs Mimecast Email Security comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Apr 20, 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
7.6
Microsoft Exchange Online Protection enhances email security, reducing incidents and boosting productivity, yielding strong ROI in the US market.
Sentiment score
3.5
Mimecast Email Security prevents breaches and blocks phishing, significantly enhancing business security despite challenges in quantifying its 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
6.8
Microsoft Exchange Online Protection support quality varies, with premium users generally reporting more consistent and timely assistance.
Sentiment score
5.5
Mimecast Email Security support is responsive but often redirects to unclear articles; mixed reviews on speed and flexibility.
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.
 

Scalability Issues

Sentiment score
8.0
Microsoft Exchange Online Protection offers scalable, adaptable security, supporting diverse organizational needs with ease and high user satisfaction.
Sentiment score
7.9
Mimecast Email Security is scalable, adaptable, and allows easy license adjustments but may face occasional feature challenges.
 

Stability Issues

Sentiment score
8.1
Microsoft Exchange Online Protection is highly rated for reliability and stability, with occasional management and configuration challenges noted.
Sentiment score
7.5
Mimecast Email Security is praised for stability and integration, with rare downtimes, few bugs, and high user satisfaction.
 

Room For Improvement

Users desire improved automation, integration, security, pricing, reporting, email handling, stability, functionality, support, and clearer product distinctions in EOP.
Mimecast Email Security struggles with detection, user interface, support, costs, configurations, and database reliance, affecting overall user satisfaction.
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.
 

Setup Cost

Microsoft Exchange Online Protection offers valued security features despite varying costs, with flexible licensing in Microsoft 365 bundles.
Mimecast Email Security is seen as costly, though features and updates justify the price; competitors offer cheaper alternatives.
The pricing is reasonable.
Microsoft Exchange is more expensive compared to other services like Gmail.
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
 

Valuable Features

Microsoft Exchange Online Protection provides scalable, user-friendly security with AI, ensuring robust anti-phishing and anti-malware protection for all businesses.
Mimecast Email Security excels in threat protection, spam filtering, and user-friendliness, with strong Microsoft 365 integration and technical support.
The security features provided by Microsoft are robust.
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.
A distinct advantage of Mimecast is its ability to block phishing and impostor attacks, which are significant threats currently.
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.
 

Categories and Ranking

Microsoft Exchange Online P...
Average Rating
8.4
Reviews Sentiment
6.9
Number of Reviews
38
Ranking in other categories
Email Security (4th), Anti-Malware Tools (8th)
Mimecast Email Security
Average Rating
8.0
Reviews Sentiment
5.9
Number of Reviews
30
Ranking in other categories
Office 365 Protection (5th), Secure Email Gateway (SEG) (3rd)
 

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 1.4%, down 2.2% compared to last year.
Mimecast Email Security, on the other hand, focuses on Secure Email Gateway (SEG), holds 16.8% mindshare, up 16.6% since last year.
Anti-Malware Tools
Secure Email Gateway (SEG)
 

Featured Reviews

Nur Mohammad - PeerSpot reviewer
An effective email security solution that provides DLP, Safe Attachment, and Safe Links
If you want extensive email security, you need to purchase a Plan 2 license. Plan 1 and Plan 2 are the two plans for Microsoft Exchange Online Protection. Some customers hesitate to purchase this product because it adds some costs to them, which is necessary for them. It would be helpful for customers if Plan 1 features were included with EOP. However, they still need to purchase Plan 2 for advanced security features. One of our clients recently requested to compare Zimbra's features with Microsoft Exchange Online Protection. Zimbra is open source, while Microsoft Exchange Online Protection is not. When I compare both the products, many free features are available in Zimbra because it is open-source software. It makes no sense to request Microsoft Exchange Online Protection add all the features people get on open-source software like Zimbra. Hence, I would say whatever features Microsoft Exchange Online Protection has are enough. Microsoft has a dedicated research team that should research and add new techniques like phishing and spamming solutions to the product.
Frank Rawson - PeerSpot reviewer
It gives clients peace of mind and helps them educate their users about threats
A few years ago, our team found the implementation to be somewhat challenging. It has gotten easier as we've grown more experienced. The difficulty depends on the expertise of the person doing it. I don't work with Mimecast every day, so it might be more difficult for me than it is for one of my techs who regularly does Mimecast implementations. It requires some specific in-depth product knowledge and an understanding of email solutions. The deployment time varies. In South Africa, it depends on who you use to deploy it. If you use one of Mimecast's local partners, it can take up to two weeks because of their process. However, it's only about four to eight hours of work. After deployment, there isn't much maintenance aside from supporting and educating your customers. Users require constant education on how to use the Mimecast client and release an email that has been blocked.
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Top Industries

By visitors reading reviews
Computer Software Company
15%
Government
9%
Financial Services Firm
9%
Manufacturing Company
7%
Computer Software Company
15%
Financial Services Firm
8%
Manufacturing Company
7%
Retailer
5%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

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?
I would like to improve the setting of rules in Microsoft Exchange Online Protection (EOP) as it is currently working fine but has room for enhancements.
What is your primary use case for Microsoft Exchange Online Protection?
I am using Microsoft Exchange Online Protection (EOP) ( /products/microsoft-exchange-online-protection-eop-reviews ) for word processing, spreadsheet management, Power BI, checking my meetings, usi...
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 is your experience regarding pricing and costs for Mimecast Email Security with Targeted Threat Protection?
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
What needs improvement with Mimecast Email Security with Targeted Threat Protection?
There is nothing that notably stands out in need of improvement at present.
 

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.
848,716 professionals have used our research since 2012.