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Microsoft Purview Customer Lockbox vs Mimecast Advanced Email Security comparison

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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
8.2
Reviews Sentiment
5.9
Number of Reviews
49
Ranking in other categories
Email Archiving (1st), Email Security (4th), Secure Email Gateway (SEG) (3rd)
 

Mindshare comparison

As of November 2026, in the Office 365 Protection category, the mindshare of Microsoft Purview Customer Lockbox is 2.9%, up from 1.6% compared to the previous year. The mindshare of Mimecast Advanced Email Security is 23.1%, up from 19.7% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Office 365 Protection Mindshare Distribution
ProductMindshare (%)
Mimecast Advanced Email Security23.1%
Microsoft Purview Customer Lockbox2.9%
Other74.0%
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…
Avinash Mishra - PeerSpot reviewer
Manager - EUC at Finthrive
Advanced email filtering has blocked massive spam volumes and prevents unauthorized data leaks
Improvements for Mimecast Advanced Email Security include enhancing the user interface and accessibility, particularly regarding admin capabilities to add or modify user accounts. Streamlining this could improve overall usability and security management for users. Reporting is another area needing improvement in Mimecast Advanced Email Security, as the reports provided are not very easy to decipher. With artificial intelligence being integrated into various tools including Mimecast Advanced Email Security, I believe there is potential to enhance functionality, enabling users to ask specific questions and retrieve concise answers instead of overwhelming data. I choose a nine for Mimecast Advanced Email Security because improvements such as better user interface and artificial intelligence integration features would greatly enhance its usability. While no tool is perfect, these adjustments could greatly elevate Mimecast Advanced Email Security's capabilities.

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."
"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."
"We like Mimecast's spam filtering. The email signature feature is also a big plus for our users."
"I would rate Mimecast Email Security a nine out of ten."
"URL inspection works pretty well."
"Email security is the most valuable feature of the solution."
"The anti-spam handling is very good, as it picks up a lot of junk, malware, and other threats."
"From the tools I have worked with, it is actually the best, and I am happy with it."
"Mimecast Mailbox Community is an email gateway required for every organization, regardless of size."
 

Cons

"The pricing for personal users is not cost-effective. It feels expensive for individual expenses."
"Certainly, the primary area needing improvement is Mimecast's customer support. Our experience as Mimecast customers has been less than satisfactory. Even when raising a priority ticket, the response time is unacceptably long, often taking around five to six hours. This level of service is disappointing. Additionally, there have been recurring service disruptions in the UK region, leading to extended email delays due to various service issues. This year alone, we've encountered such problems on approximately four occasions."
"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."
"For improvement, I would say some of the catalogs, while navigating, were a little tricky."
"Lately, Mimecast's outbound mail servers have been regularly blocklisted by spam filters. That didn't happen a few years back, but it seems to be a more frequent problem these days. When a server is blocklisted, it means all of my outgoing mail ends up in the recipient's junk mail. That affects my reputation and business confidence."
"While it's quick and easy, the initial setup could be more user-friendly."
"The solution's console interface was recently changed for the admins, but the previous one was much better because we could open tabs on it."
"As a user, the user interface of the management console could be upgraded, for example."
"The price could be better, it should be reduced."
 

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."
"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."
"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."
"The price of Mimecast Mailbox Continuity is expensive."
"The product has good pricing in terms of return on investment."
"It's an expensive solution."
"It is a bit expensive."
"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."
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Top Industries

By visitors reading reviews
No data available
Outsourcing Company
11%
Computer Software Company
9%
Financial Services Firm
9%
Construction Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business23
Midsize Enterprise12
Large Enterprise23
 

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
Hewlett-Packard Company (HP), Cushman and Wakefield, PIB Group, Swissport
Find out what your peers are saying about Proofpoint, Mimecast, Barracuda Networks and others in Office 365 Protection. Updated: October 2026.
920,929 professionals have used our research since 2012.