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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."
"My advice to those considering this product would be to go for it."
"The solution's performance is good."
"We like Mimecast's spam filtering. The email signature feature is also a big plus for our users."
"The most valuable feature is the DMARC Analyzer."
"Mimecast is a brilliant product; it works very well, I have very seldomly, if ever, had any problems with it, and it does exactly what it promises to do."
"I recommend Mimecast based on customer requirements and budget."
"The security is pretty good, and that's why we're going to upgrade to an even more advanced package. We used it when we had a power issue, and it works. It has been pretty reliable, and the support has been quite good."
"We're now certain business-critical mail is perfectly protected in multiple ways."
 

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 solution is very expensive."
"From an administrative point of view, Mimecast is a little bit cumbersome and difficult."
"From an administrative point of view, Mimecast is a little bit cumbersome and difficult. It's not something that the end-user can easily find navigate themselves."
"We have subscribed to an archival service, and yet, when we have to get our data out, we have to pay a fee to get our own data. They charge an extraction fee."
"The installation is not so straightforward."
"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."
"Technical support has been slower than it was in the past, likely due to the pandemic."
"The interface and the documentation could be improved. They can also include some more training resources and content like video. While setting things up, I had to search for the information quite a bit. It took me time to find the correct way to do something. The information is there, but it is sort of all over the place. They can create a better help knowledge base or help portal. It retains your email for 45 days. They can maybe increase this duration."
 

Pricing and Cost Advice

Information not available
"The price of Mimecast Mailbox Continuity is expensive."
"The solution is expensive."
"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."
"The product price is moderate. I rate the pricing a five out of ten."
"The customers can select the license packages as per their requirements."
"For what it is, the product is overpriced."
"It is a bit expensive."
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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.