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Microsoft Defender for Office 365 vs Microsoft Purview Insider Risk Management comparison

 

Comparison Buyer's Guide

Executive Summary

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 Defender for Offi...
Ranking in Microsoft Security Suite
10th
Average Rating
8.4
Reviews Sentiment
6.9
Number of Reviews
53
Ranking in other categories
Email Archiving (1st), Email Security (1st), Advanced Threat Protection (ATP) (2nd), Secure Email Gateway (SEG) (1st)
Microsoft Purview Insider R...
Ranking in Microsoft Security Suite
29th
Average Rating
8.0
Reviews Sentiment
5.4
Number of Reviews
4
Ranking in other categories
Insider Risk Management (2nd)
 

Mindshare comparison

As of October 2025, in the Microsoft Security Suite category, the mindshare of Microsoft Defender for Office 365 is 3.3%, up from 2.2% compared to the previous year. The mindshare of Microsoft Purview Insider Risk Management is 1.9%, up from 0.4% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Microsoft Security Suite Market Share Distribution
ProductMarket Share (%)
Microsoft Defender for Office 3653.3%
Microsoft Purview Insider Risk Management1.9%
Other94.8%
Microsoft Security Suite
 

Featured Reviews

Tolu Omolaja - PeerSpot reviewer
Great URL scanning and attachment scanning, but I would like more proactive threat analysis
The two main features that prove most beneficial for us are URL scanning and attachment scanning. URL scanning involves an automatic scan of links and emails. When a user clicks on a link within an email, the system promptly checks the link's safety. If the link is deemed safe, access is granted automatically. However, if it is flagged as unsafe, we receive feedback and notification to caution us about the potentially harmful link. At this point, we are presented with the option to proceed or return. I have personally witnessed the system identify a few unsafe links, making this the primary advantage of using the solution. The second crucial aspect is the scanning of attachments. When an email containing an attachment arrives, we receive a notification of the new email, along with information that the attachment is being scanned for threats. This additional layer of security provides peace of mind for our organization. While Microsoft Defender for Office 365 offers numerous features, these two stand out as particularly impressive and valuable to us.
Karthik Ekambaram - PeerSpot reviewer
Have consistently built secure internal environments while implementing compliance tools for diverse customer needs
The customizable alerts system needs improvement. The detection rules are not extensive enough. There should be more possibilities for creating alerts based on additional criteria. While rules can be customized, the available criteria for creating detection rules should be expanded. Microsoft's pricing is very expensive. The Business Premium offering should be extended to enterprise customers, as it's currently limited to 300 users. There should be a tier below E5 that includes Microsoft Purview and other features. Currently, E5 licensing costs approximately 6,000 INR per user per month including taxes. Competitive solutions offer similar functionality at about 50% of Microsoft's cost. Email DLP is included in Business Premium or P1 licenses, while P2 licenses cover endpoint DLP and additional channels. Microsoft should introduce an intermediate tier below E5 that covers all P1 licenses, as customers often need coverage across the entire M365 suite.

Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Pros

"Defender is a SaaS platform, so it offers more flexibility. Managing the permissions is easier. The solution's automated detection and response features are scalable."
"Microsoft Defender for Office 365 facilitates efficient management and updates through the cloud. We do not have to worry about incompatibilities. It just works."
"It gives us visibility into threats and, for endpoints, it helps us to prioritize threats. We used to have a lack of visibility, but now our time to detect and respond has decreased."
"The most valuable feature is the integration. It's a single console, so we don't have to switch around between multiple products. Another valuable feature is the ease of operations and maintenance."
"The DLP feature of Microsoft Defender for Office 365 is valuable, and we also use the DLP feature for email real-time detection."
"Our customers are satisfied with Defender for 365 because Microsoft products are easy to use and customize to meet the client's needs. Everything is in one place, so we can adjust policies as needed for phishing, DLP, ATP, or any other security features that our clients want to apply."
"Microsoft Defender for Office 365 has improved my organization's security. It makes it easier to manage the infrastructure without the help of third-party applications."
"I would say that 90% of the spam and phishing attack emails get blocked right off the bat."
"The scoring mechanism is exceptional because it eliminates the need to reinvent criteria for identifying risks, misconfigurations, or vulnerabilities."
"Microsoft Purview Insider Risk Management was helpful in performing investigations after alerts were received."
"Insider Risk Management's graphing is highly specific and useful. You can see the last six months of data for the Microsoft tenant. You can easily find what you need. For example, you can filter for alerts about devices, emails, etc."
"The best thing about Purview is that it's easy to integrate with our day-to-day environment. We have Active Directory, and Word and Excel. Using a third-party vendor and trying to integrate with our existing environment would be much more challenging."
 

Cons

"The visibility into threats is not up to the mark, as I do not have control. I rate my experience with Microsoft Defender for Office 365 as six out of ten due to troubleshooting and pricing concerns."
"In the areas of improvement for Microsoft Defender for Office 365, the console is the biggest challenge for me."
"Microsoft Defender for Office 365 should improve the troubleshooting tools. It's unclear whether the device is blocked at the firewall level or at the device itself. The granularity needed for troubleshooting is currently lacking. From my perspective, Microsoft should address this issue to benefit many users who likely share the same sentiment."
"There's room for improvement regarding the time frame for retrieving emails."
"One area for improvement is integration. For example, when it comes to external SaaS platforms, we were not able to get a lot of information on integrations with such apps for security and authentication."
"We noticed that from time to time, Microsoft's stability does have problems. Sometimes the service goes up and down. Sometimes they change without prior notice."
"Sometimes, phishing emails manage to pass through the filter, so the system needs to enhance its phishing email detection capabilities."
"Microsoft Defender for Office 365 could improve by giving customers information on techniques to prevent threats. For example, information about best practices on how to protect their own devices against hackers and scammers, such as educational information or training. This would help others have a better understanding of cyber security. Additionally, there can be more security features added."
"The reporting capabilities sometimes leave a little to be desired. It could be improved in terms of producing reports to provide information to the C-suite or others."
"The user interface also isn't user-friendly. When we introduce Insider Risk Management to our clients, they often find it difficult to understand. There is too much information, and the UI is not scalable. Also, entry-level IT technicians are not always interested in learning something new. It should be clearer and easier to understand."
"Microsoft's pricing is very expensive. The Business Premium offering should be extended to enterprise customers, as it's currently limited to 300 users."
"For certain things, you need to install an agent. I understand it's for integrity, but if there could be a clientless solution for certain aspects, it would make life easier."
 

Pricing and Cost Advice

"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."
"Defender for 365 comes in various plans and licenses, along with other Microsoft security solutions. Purchasing this kind of package or security bundle gives good value for money, and that's what I recommend."
"Compared to other brands, Microsoft Defender for Office 365's pricing is competitive."
"The pricing is normal. Considering its popularity, it's not overpriced."
"I know that the product is incredibly expensive."
"The product is very expensive."
"I was working in the government and it was too expensive for us to use our Microsoft products."
"The pricing has become expensive."
Information not available
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Top Industries

By visitors reading reviews
Computer Software Company
15%
Financial Services Firm
8%
Manufacturing Company
8%
Comms Service Provider
6%
Computer Software Company
37%
Financial Services Firm
8%
Manufacturing Company
5%
Comms Service Provider
5%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business23
Midsize Enterprise8
Large Enterprise27
No data available
 

Questions from the Community

What do you like most about Microsoft Defender for Office 365?
Threat Explorer is an invaluable tool for me, and it plays a crucial role in helping me discern the origins of various email campaigns, pinpointing where they emanate from, and identifying the indi...
What is your experience regarding pricing and costs for Microsoft Defender for Office 365?
Microsoft is quite affordable with a lot of features available for any size organization.
What needs improvement with Microsoft Defender for Office 365?
I think that Microsoft Defender for Office 365 could be improved if it could use VirusTotal to compare the programs or anything that I download. VirusTotal helps to identify viruses, malware, troja...
What needs improvement with Microsoft Purview Insider Risk Management?
The reporting capabilities sometimes leave a little to be desired. It could be improved in terms of producing reports to provide information to the C-suite or others.
What is your primary use case for Microsoft Purview Insider Risk Management?
The primary use case for Microsoft Purview Insider Risk Management was data loss prevention. This was my main objective.
What advice do you have for others considering Microsoft Purview Insider Risk Management?
I would recommend Microsoft Purview Insider Risk Management to others. I would rate the overall solution as a nine.
 

Also Known As

MS Defender for Office 365
Microsoft Insider Risk Management
 

Overview

 

Sample Customers

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Information Not Available
Find out what your peers are saying about Microsoft Defender for Office 365 vs. Microsoft Purview Insider Risk Management and other solutions. Updated: September 2025.
869,513 professionals have used our research since 2012.