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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
8.0
Reviews Sentiment
5.9
Number of Reviews
48
Ranking in other categories
Email Archiving (2nd), Email Security (5th), Secure Email Gateway (SEG) (3rd)
 

Mindshare comparison

As of September 2026, in the Office 365 Protection category, the mindshare of Microsoft Purview Customer Lockbox is 2.5%, up from 1.1% compared to the previous year. The mindshare of Mimecast Advanced Email Security is 22.6%, up from 19.6% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Office 365 Protection Mindshare Distribution
ProductMindshare (%)
Mimecast Advanced Email Security22.6%
Microsoft Purview Customer Lockbox2.5%
Other74.9%
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."
"The most valuable feature is the DMARC Analyzer."
"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."
"The product is good. To date, we have not faced any challenges."
"It's good, it keeps the spam out, and it does a really good job at not allowing threats through."
"Mimecast is pretty good, even if you're on Office 365."
"The solution is scalable."
"The piece that is most valuable from the Mimecast standpoint will be the sandboxing feature."
"It does a good job for us, and its admin console is easy to use."
 

Cons

"The pricing for personal users is not cost-effective. It feels expensive for individual expenses."
"It was not a good experience due to the fact that our main infrastructure had a problem for that entire time."
"I don't think it's ideally suited for maybe a smaller business environment, like, for example, for companies with less than 100 seats."
"Technical support has been slower than it was in the past, likely due to the pandemic."
"The filtering needs more flexibility."
"For improvement, I would say some of the catalogs, while navigating, were a little tricky."
"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."
"The feature that should be included is to remove the block on the encrypted files."
"The solution is very expensive."
 

Pricing and Cost Advice

Information not available
"For what it is, the product is overpriced."
"The price of Mimecast Mailbox Continuity 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."
"The licensing costs are per-user for the product that you get with them."
"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."
"The solution is expensive."
"The product has good pricing in terms of return on investment."
"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."
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Top Industries

By visitors reading reviews
No data available
Outsourcing Company
10%
Computer Software Company
10%
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 Business20
Midsize Enterprise13
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, Sophos and others in Office 365 Protection. Updated: September 2026.
913,924 professionals have used our research since 2012.