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

 

Comparison Buyer's Guide

Executive SummaryUpdated on Nov 2, 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
5.5
Users have mixed ROI views on Mimecast Email Security, noting its effectiveness against threats but questioning cost-efficiency.
There is definitely a return on investment when using Mimecast, as it blocks phishing emails, reducing the risk of significant financial losses.
Senior Tech. Lead at WE
 

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
5.6
Mimecast Email Security support is helpful but has mixed reviews due to delays and reliance on indirect solutions.
Microsoft offers excellent 24/7 support.
System Administrator at Shubham housing finance
My team is able to get the help they need when necessary.
General Manager at Ambient iT
Support personnel are hesitant to engage in remote sessions, preferring to share documentation via email.
Senior Tech. Lead at WE
Mimecast technical support is generally quite good.
Information Security Analyst at Enfield Central Library
I would rate my experience with technical support of Mimecast Email Security between seven and eight out of ten for their support.
Email Security Engineer at Logic Infosecurity
 

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
7.0
Mimecast Email Security is praised for adaptability and scalability, supporting various industries despite minor feature challenges.
If Mimecast Email Security introduces API solutions, it will dominate the market.
Email Security Engineer at Logic Infosecurity
 

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 reliable and stable, with minimal glitches, occasional delays, and high user ratings for performance.
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.
Email Security Engineer at Logic Infosecurity
 

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 needs improvements in pricing, detection, complexity, user interface, support, and reducing false positives and attachment issues.
The user interface of Microsoft Exchange Online Protection (EOP) has room for improvement.
Director at a tech services company with 11-50 employees
Improving the search process by allowing searches with different types of parameters and facilitating searches within emails would be advantageous.
General Manager at Ambient iT
A lot of emails were missed despite being known samples.
Senior Tech. Lead at WE
Mimecast Email Security is somewhat expensive compared to the competition in the Indian market.
Co-Founder & VP-Sales at QuantumShield Technologies LLP
Mimecast Email Security can be improved by adding some API integrations.
Email Security Engineer at Logic Infosecurity
 

Setup Cost

Microsoft Exchange Online Protection offers tiered pricing, seen as high but justified by robust security and scalability features.
Mimecast Email Security is often seen as costly due to user-based licensing and added fees, despite potential discounts.
The pricing is reasonable.
General Manager at Ambient iT
Microsoft Exchange is more expensive compared to other services like Gmail.
System Administrator at Shubham housing finance
I find the price of Microsoft Exchange Online Protection (EOP) to be fairly reasonable, and I have no problems with it.
Director at a tech services company with 11-50 employees
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
Senior Tech. Lead at WE
 

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, easy setup, seamless Microsoft 365 integration, and excellent scalability and support.
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.
Director at a tech services company with 11-50 employees
It offers more features and better security, making it the best option for corporate environments.
System Administrator at Shubham housing finance
In the last three years, has resulted in no antivirus problems.
Head Of Information Technology at a government with 201-500 employees
Mimecast Email Security is a good solution because our customers haven't reported any phishing emails being delivered.
Email Security Engineer at Logic Infosecurity
A distinct advantage of Mimecast is its ability to block phishing and impostor attacks, which are significant threats currently.
Senior Tech. Lead at WE
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.
Information Security Analyst at Enfield Central Library
 

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 (7th), Anti-Malware Tools (12th)
Mimecast Email Security
Average Rating
8.0
Reviews Sentiment
5.9
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 1.1%, down 1.5% compared to last year.
Mimecast Email Security, on the other hand, focuses on Secure Email Gateway (SEG), holds 14.4% mindshare, up 12.5% since last year.
Anti-Malware Tools Market Share Distribution
ProductMarket Share (%)
Microsoft Exchange Online Protection (EOP)1.1%
Microsoft Defender for Endpoint9.1%
F-Secure Total4.4%
Other85.4%
Anti-Malware Tools
Secure Email Gateway (SEG) Market Share Distribution
ProductMarket Share (%)
Mimecast Email Security14.4%
Microsoft Defender for Office 36524.2%
Proofpoint Email Protection20.3%
Other41.099999999999994%
Secure Email Gateway (SEG)
 

Featured Reviews

HP
Cloud Consultant at Ensono
Service provider benefits from effective email security management and seeks enhanced customer support
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 connecting to other parts of the Microsoft suite, but it depends on the license you have. There aren't significant concerns with Microsoft Exchange Online Protection (EOP), as it depends on what customers expect; if they expect more features, then it depends on what Microsoft 365 license they have. The important thing is to ensure they are using all the security features they get with their licensing. The basic one is Microsoft Exchange Online Protection (EOP). While it's nice to have more functionality, that's available through other licensing programs with Microsoft. While we'd prefer more features, as a basic tool, it's fine, but more advanced features come with the add-ons from other parts of the Microsoft 365 licensing. One feature that could improve Microsoft Exchange Online Protection (EOP) is automated malware detection, where it actually analyzes the file offline in a sandbox to determine if it's safe, potentially reducing false positives.
RP
Senior Tech. Lead at WE
Block significant threats with enhanced phishing prevention
In terms of efficacy, Proofpoint is better than Mimecast, though it's a little difficult to manage. A distinct advantage of Mimecast is its ability to block phishing and impostor attacks, which are significant threats currently. Security is a major feature where email security tools like Mimecast have delivered value by identifying and preventing phishing emails.
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879,899 professionals have used our research since 2012.
 

Top Industries

By visitors reading reviews
Computer Software Company
13%
Financial Services Firm
10%
Manufacturing Company
8%
Government
7%
Computer Software Company
14%
Financial Services Firm
8%
Manufacturing Company
6%
Comms Service Provider
5%
 

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 Business17
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?
The user interface of Microsoft Exchange Online Protection (EOP) has room for improvement, as at times it doesn't make sense where to go to access certain features.
What is your primary use case for Microsoft Exchange Online Protection?
My use case for Microsoft Exchange Online Protection (EOP) is basically to protect ourselves from phishing emails and to improve our email security.
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?
Mimecast Email Security can be improved by adding some API integrations. Instead of remaining a traditional gateway, Mimecast Email Security needs to provide API solutions similar to Check Point.
 

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.
879,899 professionals have used our research since 2012.