No more typing reviews! Try our Samantha, our new voice AI agent.

Microsoft Defender for Office 365 vs Microsoft Sentinel 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:
 

ROI

Sentiment score
7.1
Microsoft Defender for Office 365 boosts efficiency, cuts phishing, integrates security, reduces tool costs, and mitigates risk.
Sentiment score
6.8
Microsoft Sentinel enhances ROI with faster incident response, automation, and cost efficiency, providing significant operational and security improvements.
It has also decreased our time to detection and response by about 15 to 20 percent.
Technology support manager at Alfred State College
Overall, cost of owning and operating our system goes down.
Designation Chief Consultant at Avtow
It's hard to quantify the return on investment we've seen from Microsoft Defender for Office 365.
Chief Architect at a tech vendor with 1,001-5,000 employees
If a customer is already using Microsoft’s ecosystem, the ROI can be positive due to seamless integration.
senior cyber security at a tech services company with 201-500 employees
Our MTTR, mean time to response, improved by forty to fifty percent. Earlier, medium-severity incidents took two to three hours to resolve. Now, after Microsoft Sentinel, it is forty to fifty-five minutes.
Cyber Security Consultant at HR Software Solution
We attribute our growth to Sentinel.
Chief Commercial Officer at defend
 

Customer Service

Sentiment score
5.7
Microsoft Defender for Office 365 support is reliable but varies with subscription level and complexity of issues.
Sentiment score
6.4
Microsoft Sentinel customer service is praised for staff expertise, but premium support is quicker; communication consistency could improve.
Over the past two years, there have been no critical problems.
Solution Consultant at BIM Group of Companies
we opened tickets, and they typically resolve them quickly.
Chief Architect at a tech vendor with 1,001-5,000 employees
With a subscription for Microsoft Defender for Office 365, it is an eight. Without it, it is a six.
Manager at a tech services company with 10,001+ employees
Microsoft invests significantly in support, which is crucial for companies.
Director de Microsoft y Transformación Digital at Compucad
I believe Microsoft could improve by keeping customer service within the US for Microsoft Sentinel customers who are within state and federal government sectors.
Infosec at a government with 10,001+ employees
Working with a Sentinel engineer helped us tune settings effectively.
Systems Emgineer at a non-profit with 1-10 employees
 

Scalability Issues

Sentiment score
7.8
Microsoft Defender for Office 365 efficiently scales with cloud-native design, ensuring reliable performance and seamless integration for diverse organizations.
Sentiment score
7.7
Microsoft Sentinel is highly scalable, cloud-native, and integrates easily, but users should consider data ingestion costs.
We have never faced scalability problems, and Microsoft manages it effectively.
Solution Consultant at BIM Group of Companies
Microsoft Defender for Office 365 scales transparently for us, as we grew from 1,000 users to 3,000 users, and we didn't notice much difference.
Chief Architect at a tech vendor with 1,001-5,000 employees
Microsoft Defender for Office 365 scales with the growing needs of my company well.
Senior Client Director and Advisory Service Leader at Crossfuze
There is no need to add hardware or redesign infrastructure because it is cloud-native.
Cyber Security Consultant at HR Software Solution
As our organization uses Microsoft Azure and Defender, everything grows together, and we can integrate various features seamlessly.
Systems Emgineer at a non-profit with 1-10 employees
Being a SaaS solution, the scalability of Microsoft Sentinel is robust.
senior cyber security at a tech services company with 201-500 employees
 

Stability Issues

Sentiment score
7.8
Microsoft Defender for Office 365 offers consistently reliable performance with minimal downtime, high user ratings, and manageable minor issues.
Sentiment score
7.8
Microsoft Sentinel is reliable with high uptime, minor outages, and strong security, despite some customization challenges.
I would rate the stability of Microsoft Defender for Office 365 as 10 over 10 because it's highly available, it works, and it does the job it is meant to do.
Cloud Solutions Architect at a tech services company with 201-500 employees
I have not experienced any downtime, crashes, or performance issues because of Defender.
Technology Associate at a financial services firm with 51-200 employees
The solution is stable, as we have been using it for the past two years.
Solution Consultant at BIM Group of Companies
I have never experienced any downtime, crashes, or performance issues with Microsoft Sentinel because it is SOC as a Service, so it maintains 100% uptime and scaling.
Infosec at a government with 10,001+ employees
In the past two years, our team hasn't encountered any issues with the stability of Microsoft Sentinel from an operations perspective.
Project Executive at synergyc
I need to be aware of deprecated connectors as they may disconnect, but the data continues to be sent with a need for quick adaptation.
senior cyber security at a tech services company with 201-500 employees
 

Room For Improvement

Microsoft Defender for Office 365 needs improvements in usability, false positive reduction, phishing detection, scalability, and reporting capabilities.
Microsoft Sentinel needs enhancements in integration, usability, performance, automation, and cost management to better serve users and organizations.
The main area for improvement is simplifying the implementation and rollout process.
Infrastructure and Security Lead at Vedanta
Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published.
Solution Consultant at BIM Group of Companies
There is a different console for different things; I just want one consolidated console.
Senior Director, Security Architecture & Engineering at a leisure / travel company with 10,001+ employees
Log ingestion and retention costs can grow quickly, and understanding which data source is driving cost is not always straightforward.
Cyber Security Consultant at HR Software Solution
We have some tools, such as our off-site Meraki firewalls, that have not fully integrated with Sentinel.
Systems Emgineer at a non-profit with 1-10 employees
There are complexities in calculating the right pricing tier for different customers, which makes it difficult for me as a consultant during upfront pricing.
senior cyber security at a tech services company with 201-500 employees
 

Setup Cost

Microsoft Defender for Office 365 is cost-effective with E5, costly standalone, requiring careful planning for subscription-based licensing.
Microsoft Sentinel's flexible pricing can be costly, but cost-effective within the Microsoft ecosystem with optimization strategies in place.
We've likely saved 30% of costs.
Designation Chief Consultant at Avtow
Money-wise, it is a part of the Office 365 suite, making it slightly more expensive compared to Trend Micro.
Infrastructure and Security Lead at Vedanta
Microsoft is quite affordable with a lot of features available for any size organization.
Solution Consultant at BIM Group of Companies
It has been beneficial that Microsoft Sentinel is included as part of the Microsoft package, making it more cost-effective.
Senior System Administrator at a university with 5,001-10,000 employees
Microsoft Sentinel is not a low-cost SIEM.
Cyber Security Consultant at HR Software Solution
Microsoft Sentinel is provided at no cost, so we didn't have any issues with the cost.
Vice President, Sales, Cybersecurity at a computer software company with 51-200 employees
 

Valuable Features

Microsoft Defender for Office 365 enhances security with AI-driven phishing detection and robust protection across Microsoft 365 services.
Microsoft Sentinel enhances security with AI-driven threat detection, automated responses, seamless integration, and efficient threat management through playbooks and analytics.
It ranks the threats and allows us to prioritize those hitting us the hardest, such as email threats.
Technology support manager at Alfred State College
It provides end-to-end visibility on email threats such as phishing, extending beyond Exchange Online Protection.
Solution Consultant at BIM Group of Companies
The value of the DLP feature is significant to us because we have internal data, sometimes sensitive, and the users may not always be aware of security and privacy, which might lead them to send out information mistakenly to external parties.
Chief Architect at a tech vendor with 1,001-5,000 employees
Microsoft Sentinel's ability to correlate data from multiple sources and its detection capabilities are essential.
Cost Engineer at a tech vendor with 10,001+ employees
Microsoft Sentinel has improved cost efficiency, which is one of the key areas we're able to win business against the ability to have threat intelligence.
Chief Commercial Officer at defend
Microsoft Sentinel's ability to correlate data from multiple sources enhances our threat detection capabilities beyond what is a simple data lake solution by filtering out the noise and consolidating the signal down to a meaningful level that is easier to investigate and see.
Solutions Architect at a tech vendor with 201-500 employees
 

Categories and Ranking

Microsoft Defender for Offi...
Ranking in Microsoft Security Suite
9th
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
61
Ranking in other categories
Email Archiving (1st), Email Security (2nd), Advanced Threat Protection (ATP) (3rd), Secure Email Gateway (SEG) (2nd)
Microsoft Sentinel
Ranking in Microsoft Security Suite
6th
Average Rating
8.2
Reviews Sentiment
6.9
Number of Reviews
108
Ranking in other categories
Security Information and Event Management (SIEM) (4th), Security Orchestration Automation and Response (SOAR) (3rd), AI-Powered Cybersecurity Platforms (6th)
 

Mindshare comparison

As of August 2026, in the Microsoft Security Suite category, the mindshare of Microsoft Defender for Office 365 is 3.8%, up from 2.9% compared to the previous year. The mindshare of Microsoft Sentinel is 5.2%, up from 4.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Microsoft Security Suite Mindshare Distribution
ProductMindshare (%)
Microsoft Sentinel5.2%
Microsoft Defender for Office 3653.8%
Other91.0%
Microsoft Security Suite
 

Featured Reviews

Emeka Ndulu - PeerSpot reviewer
Cloud Solutions Architect at a tech services company with 201-500 employees
Improves threat visibility and response while reducing manual tasks and training users against phishing
I appreciate the attack simulation feature whereby I get to train users and educate them on how to identify phishing emails and spam emails, as well as the anti-spam protection. It gives me visibility into my threat environment and threat landscape to ensure that I am one step ahead of any likelihood of threats within my environment. I get to detect it and respond, so the threat intelligence is very effective. Microsoft security solutions save my time. It saves money because once I protect my environment, I don't lose money. It has decreased my detection time and my time to respond.
Kallamuddin Ansari - PeerSpot reviewer
Cyber Security Consultant at HR Software Solution
Centralized monitoring has improved threat response but cost control still needs refinement
Based on real operations used in our corporate IT environment, the key features include log correlation and incident view. Microsoft Sentinel's biggest strength is how it correlates multiple related alerts into a single incident. This significantly reduces alert noise and helps the SOC focus on real threats instead of isolated events. Another valuable feature is KQL-based threat hunting with Kusto Query Language. The flexibility of this language allows us to build custom hunting queries based on our environment's behavior. This is extremely useful for detecting low and slow threats or hidden threats that default rules may miss. Cloud-native scalability and stability is another important feature. Being cloud-native, Microsoft Sentinel scales well for medium to large corporate environments without infrastructure management. Stability has been solid in day-to-day production. SOAR automation using playbooks is a feature we highly recommend. Microsoft Sentinel's SOAR functionality helps automate repetitive SOC tasks like alert enrichment and notification. This saves analyst time and improves response consistency.
report
Use our free recommendation engine to learn which Microsoft Security Suite solutions are best for your needs.
909,725 professionals have used our research since 2012.
 

Top Industries

By visitors reading reviews
Computer Software Company
11%
Manufacturing Company
9%
Financial Services Firm
9%
Comms Service Provider
7%
Financial Services Firm
11%
Manufacturing Company
10%
Computer Software Company
10%
Government
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business24
Midsize Enterprise11
Large Enterprise32
By reviewers
Company SizeCount
Small Business44
Midsize Enterprise24
Large Enterprise46
 

Questions from the Community

What is your experience regarding pricing and costs for Microsoft Defender for Office 365?
My experience with pricing, setup, and licensing is that it's actually quite reasonable even on the licensing side as a standalone product. It's very competitive compared to what competitors are ch...
What needs improvement with Microsoft Defender for Office 365?
I think Microsoft Defender for Office 365 can be improved by creating more educational pieces about not just looking for malware. We are seeing a lot more malware-less emails that Defender for Offi...
What is your primary use case for Microsoft Defender for Office 365?
My main use cases for Microsoft Defender for Office 365 include email hygiene.
Is there a common threat intelligence tool that aggregates multiple threat intelligence sources?
Yes, Azure Sentinel is a SIEM on the Cloud. Multiple data sources can be uploaded and analyzed with Azure Sentinel and its Threat Hunting functionality with AI available as templates or customized ...
What is a better choice, Splunk or Azure Sentinel?
It would really depend on (1) which logs you need to ingest and (2) what are your use cases Splunk is easy for ingestion of anything, but the charge per GB/Day Indexed and it gets expensive as log ...
Which is better - Azure Sentinel or AWS Security Hub?
We like that Azure Sentinel does not require as much maintenance as legacy SIEMs that are on-premises. Azure Sentinel is auto-scaling - you will not have to worry about performance impact, you will...
 

Also Known As

MS Defender for Office 365
Azure Sentinel
 

Overview

 

Sample Customers

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Microsoft Sentinel is trusted by companies of all sizes including ABM, ASOS, Uniper, First West Credit Union, Avanade, and more.
Find out what your peers are saying about Microsoft Defender for Office 365 vs. Microsoft Sentinel and other solutions. Updated: June 2026.
909,725 professionals have used our research since 2012.