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Microsoft Purview Customer Lockbox vs Mimecast Email and Collaboration Threat Protection comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Feb 11, 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 Email and Collabor...
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 May 2026, in the Office 365 Protection category, the mindshare of Microsoft Purview Customer Lockbox is 1.8%, down from 2.0% compared to the previous year. The mindshare of Mimecast Email and Collaboration Threat Protection is 23.9%, 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 Protection23.9%
Microsoft Purview Customer Lockbox1.8%
Other74.3%
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, and I like the dashboard and the undo or multi-call feature of Microsoft Purview Customer Lockbox."
"The most important feature is data processing."
"I recommend Mimecast based on customer requirements and budget."
"In terms of technical superiority and the product itself, there are no complaints."
"The initial setup is easy."
"We're now certain business-critical mail is perfectly protected in multiple ways."
"It is our spam filter, phishing filter, and executive impersonation filter."
"It's good, it keeps the spam out, and it does a really good job at not allowing threats through."
"Due to our specialized use case, that HIPAA dictionary really comes in handy."
"It has all the features required for distribution, such as the ability to mail."
 

Cons

"The pricing for personal users is not cost-effective. It feels expensive for individual expenses."
"The pricing for personal users is not cost-effective."
"The solution is expensive in comparison to similar solutions."
"Their support should be improved. They are notorious for sending you to knowledge-based articles rather than actually talking to you about the problem you're reporting."
"The price of the solution is expensive. It can improve by reducing the price."
"The feature that should be included is to remove the block on the encrypted files."
"From an administrative point of view, Mimecast is a little bit cumbersome and difficult."
"We discussed the phishing aspect, the DNS system, and the key rotation."
"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."
"Their support should be improved. They are notorious for sending you to knowledge-based articles rather than actually talking to you, but that is, unfortunately, kind of becoming a trend with everything. In terms of features, I haven't had any complaints. However, I don't like the fact they moved to a paid training subscription model. They used to have a lot of free webinars for training, but they have started to charge for them in the past year."
 

Pricing and Cost Advice

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

By visitors reading reviews
No data available
Computer Software Company
11%
Financial Services Firm
9%
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, Mimecast Advanced Email Security
 

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: April 2026.
893,915 professionals have used our research since 2012.