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Microsoft Purview Customer Lockbox vs Mimecast Advanced Email Security comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Jun 2, 2026

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
7th
Average Rating
9.0
Reviews Sentiment
7.9
Number of Reviews
1
Ranking in other categories
No ranking in other categories
Mimecast Advanced Email Sec...
Ranking in Office 365 Protection
2nd
Average Rating
8.0
Reviews Sentiment
5.9
Number of Reviews
39
Ranking in other categories
Email Archiving (2nd), Secure Web Gateways (SWG) (15th), Secure Email Gateway (SEG) (3rd)
 

Mindshare comparison

As of June 2026, in the Office 365 Protection category, the mindshare of Microsoft Purview Customer Lockbox is 1.9%, down from 2.1% compared to the previous year. The mindshare of Mimecast Advanced Email Security is 23.4%, up from 19.1% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Office 365 Protection Mindshare Distribution
ProductMindshare (%)
Mimecast Email and Collaboration Threat Protection23.4%
Microsoft Purview Customer Lockbox1.9%
Other74.7%
Office 365 Protection
 

Featured Reviews

Mayeen Uddin - PeerSpot reviewer
Officer at SFIL
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…
HS
Email Security Engineer at Logic Infosecurity
Experience high detection and user-friendly policies with reliable email security implementation
The system is not user-friendly because you have to create policies that are mapped in a dictionary. As an IT engineer, I understand how it works, but explaining it to another IT person can be difficult. Having more user-friendly dashboards would improve the work experience. In Mimecast Email Security, checking policies in the dictionary or gateway is very complicated, and not everyone understands this process. If you examine the Check Point portal, it's user-friendly with easily accessible tabs that anyone can explore. With Mimecast Email Security, making changes might impact existing mailboxes. The portal is complicated compared to Check Point's user-friendly interface.

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."
"The most important feature is data processing, and I like the dashboard and the undo or multi-call feature of Microsoft Purview Customer Lockbox."
"We like Mimecast's spam filtering. The email signature feature is also a big plus for our users."
"Mimecast certainly helped my customers reduce phishing emails."
"It's good, it keeps the spam out, and it does a really good job at not allowing threats through."
"The reviewer gave Mimecast Email Security a rating of 10 out of 10."
"Mimecast is pretty good, even if you're on Office 365."
"The solution offers good technical support."
"My advice to those considering this product would be to go for it."
"Based on overall experience, Mimecast Email Security is the best solution for traditional gateways."
 

Cons

"The pricing for personal users is not cost-effective."
"The pricing for personal users is not cost-effective. It feels expensive for individual expenses."
"The installation is not so straightforward."
"Its pricing can be improved. It is a bit expensive."
"The filtering needs more flexibility."
"Its pricing can be improved. It is a bit expensive."
"They could provide a unified licensing model, including all the security features."
"Technical support has been slower than it was in the past, likely due to the pandemic."
"As for areas for improvement within Mimecast Web Security, I believe there is quite a lot that can be improved."
"Mimecast Email Security is somewhat expensive compared to the competition in the Indian market, and the local presence is lacking as they do not have a local representative currently."
 

Pricing and Cost Advice

Information not available
"Compared to the other products in the market, it is neither cheap but nor very expensive. I would rate it somewhere in the middle, 5 out of 10."
"Its price is in the middle range. It is a structured licensing model where there are various components that you can add or choose to add or not."
"Two subscription options are currently offered: monthly and yearly. My suggestion is to opt for the yearly subscription as it can give some discount. The pricing isn't high as other cloud solutions are pricier than Microsoft's offerings."
"It's an expensive solution."
"The price of Mimecast Mailbox Continuity is expensive."
"On a scale of one to ten, where one is cheap, and ten is expensive, I rate the pricing a ten."
"The customers can select the license packages as per their requirements."
"Compared to the other solutions in the market, Mimecast Email Security with Targeted Threat Protection's pricing is fine."
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Top Industries

By visitors reading reviews
No data available
Computer Software Company
12%
Financial Services Firm
8%
Comms Service Provider
6%
Government
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business19
Midsize Enterprise11
Large Enterprise13
 

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 needs improvement with Mimecast Email Security with Targeted Threat Protection?
There is room for improvement since new threats are emerging. Considering the availability of new features would be worthwhile. Mimecast Email Security is somewhat expensive compared to the competi...
 

Also Known As

No data available
Mimecast Email Security with Targeted Threat Protection, Mimecast Web Security, Mimecast Mailbox Continuity, Email and Collaboration 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 Proofpoint, Mimecast, Sophos and others in Office 365 Protection. Updated: May 2026.
896,692 professionals have used our research since 2012.