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Microsoft Purview Customer Lockbox vs Mimecast Email Security comparison

 

Comparison Buyer's Guide

Executive Summary

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

Microsoft Purview Customer ...
Ranking in Office 365 Protection
8th
Average Rating
9.0
Reviews Sentiment
7.9
Number of Reviews
1
Ranking in other categories
No ranking in other categories
Mimecast Email Security
Ranking in Office 365 Protection
3rd
Average Rating
8.0
Reviews Sentiment
6.1
Number of Reviews
31
Ranking in other categories
Secure Email Gateway (SEG) (4th)
 

Mindshare comparison

As of October 2025, in the Office 365 Protection category, the mindshare of Microsoft Purview Customer Lockbox is 1.0%, down from 2.9% compared to the previous year. The mindshare of Mimecast Email Security is 19.1%, up from 13.1% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Office 365 Protection Market Share Distribution
ProductMarket Share (%)
Mimecast Email Security19.1%
Microsoft Purview Customer Lockbox1.0%
Other79.9%
Office 365 Protection
 

Featured Reviews

Mayeen Uddin - PeerSpot reviewer
Dashboard functionality and data processing offer value with an easy setup
We are using Microsoft Purview Customer Lockbox for email access The most important feature is data processing. I like the dashboard and the undo or multi-call feature of Microsoft Purview Customer Lockbox. The pricing for personal users is not cost-effective. It feels expensive for individual…
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.

Quotes from Members

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

Pros

"The most important feature is data processing."
"It's really quite user-friendly. In terms of technical superiority and the product itself, there are no complaints. It is really cutting edge."
"The solution offers good technical support."
"The reviewer gave Mimecast Email Security a rating of 10 out of 10."
"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."
"In terms of efficacy, Proofpoint is better than Mimecast, though it's a little difficult to manage."
"The solution's performance is good."
"The initial setup is easy."
"The solution is pretty straightforward to use and easy to set up."
 

Cons

"The pricing for personal users is not cost-effective."
"We discussed the phishing aspect, the DNS system, and the key rotation."
"The solution is very expensive."
"The filtering needs more flexibility."
"While it's quick and easy, the initial setup could be more user-friendly."
"Mimecast needs to reduce the number of false positive emails; a big pain point for us."
"They could provide a unified licensing model, including all the security features."
"The solution should include more AI features instead of Mimecast's more general static configuration tooling."
"Many of our users complain that the system is blocking too many attachments. It's a good practice from a security perspective, but our users think Mimecast is doing too much. It might be something we'll have to adjust."
 

Pricing and Cost Advice

Information not available
"On a scale of one to ten, where one is cheap, and ten is expensive, I rate the pricing a ten."
"It is a bit expensive."
"The product has good pricing in terms of return on investment."
"The customers can select the license packages as per their requirements."
"The product price is moderate. I rate the pricing a five out of ten."
"The licensing costs are per-user for the product that you get with them."
"For what it is, the product is overpriced."
"I'm always going to say the price needs to be lower, but it's reasonable."
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Top Industries

By visitors reading reviews
No data available
Computer Software Company
15%
Financial Services Firm
7%
Manufacturing Company
7%
Comms Service Provider
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business16
Midsize Enterprise7
Large Enterprise11
 

Questions from the Community

What needs improvement with Microsoft Purview Customer Lockbox?
The pricing for personal users is not cost-effective. It feels expensive for individual expenses.
What is your primary use case for Microsoft Purview Customer Lockbox?
We are using Microsoft Purview Customer Lockbox for email access.
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

No data available
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 Sophos, Proofpoint, Mimecast and others in Office 365 Protection. Updated: September 2025.
868,787 professionals have used our research since 2012.