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Microsoft Defender for Office 365 vs SonicWall Email Security comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Dec 3, 2024

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 Email Security
2nd
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
61
Ranking in other categories
Email Archiving (2nd), Advanced Threat Protection (ATP) (3rd), Microsoft Security Suite (8th), Secure Email Gateway (SEG) (2nd)
SonicWall Email Security
Ranking in Email Security
26th
Average Rating
7.6
Reviews Sentiment
6.6
Number of Reviews
15
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of November 2026, in the Email Security category, the mindshare of Microsoft Defender for Office 365 is 5.0%, down from 10.6% compared to the previous year. The mindshare of SonicWall Email Security is 0.9%, up from 0.5% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Security Mindshare Distribution
ProductMindshare (%)
Microsoft Defender for Office 3655.0%
SonicWall Email Security0.9%
Other94.1%
Email Security
 

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.
Mahendra Basera - PeerSpot reviewer
Sr. Engineer at InterGlobe Technology Quotient
Improved email threat visibility and security posture through adaptive reputation and analytics
I have experience with Cisco and other vendors like Sophos. I have more than 10 years of experience in this field. I worked with the Adaptive Reputation Management feature of SonicWall. Machine learning plays an important role in updating threat intelligence, particularly with SonicWall. The pricing for SonicWall Email Security is reasonable and budget-friendly. My overall rating for SonicWall Email Security is 8 out of 10 because, apart from the areas that need improvement, it was overall good.

Quotes from Members

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

Pros

"Microsoft Defender for Office 365 is a stable solution."
"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."
"Microsoft Defender has a feature to protect each and every attachment. Even if it's an encrypted attachment, it will check for any potential threats."
"The stability of Microsoft Defender for Office 365 is fantastic."
"Does a thorough job of examining email and URLs for malicious content."
"We use Microsoft Defender for its ability to integrate with existing business technologies, which is beneficial for protecting business areas."
"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 individuals within our organization who are affected."
"It definitely is a must for email protection and O365 app DLP, and combined with Microsoft Defender for Endpoint, Microsoft Defender for Identity, and MCAS, it provides a holistic solution for threat protection, email protection, O365 apps protection, and DLP for both internal and external risks."
"Behind the reason we chose SonicWall for my company is it has excellent packet analysis of normal and SSL encrypted traffic, application intelligence visualization and control, multiple Gigabit Ethernet LAN and WAN ports, flexible configuration and redundancy options."
"According to our customers, the product's most valuable feature is the ability to detect spam and reduce phishing emails."
"It is a very scalable solution."
"The most valuable features are the anti-spam, anti-phishing, anti-virus, and anti-spoofing."
"We always get ROI from the product we are using; it is completely flexible and acceptable according to our security requirements over the last four years and currently."
"SonicWall Email Security uses multi-layer cloud security."
"Setup was easy. It took about 30 minutes."
"The pricing for SonicWall Email Security is reasonable and budget-friendly."
 

Cons

"The product must provide better malware detection."
"We are waiting for better software to block viruses."
"The custom alerts have to improve a lot."
"Microsoft sometimes has downtime, and we'll get several incidents coming in back to back. We have a huge backlog of notifications, many of which may be false positives. However, there might be serious alerts, so we can't risk dismissing all of them at once."
"The pre-sales cost calculations could be more transparent."
"Microsoft needs to broaden its global support presence by establishing teams of subject-matter experts in all regions."
"Too many false positives and lacks an accurate capability to detect malicious SharePoint sites."
"Sometimes, phishing emails manage to pass through the filter, so the system needs to enhance its phishing email detection capabilities."
"The reporting needs improvement."
"The protection level for email security isn't 100%. I'm still getting some spam and junk mail."
"I am not satisfied with phishing protection, as it falls completely under the email domain security."
"Previously, we had an issue with a faulty appliance and had to wait over two weeks for a replacement."
"The after-sale support needs improvement. They don't have representation in my country."
"Policy deployment could be time consuming and represents an area for improvement in SonicWall Email Security."
"The technical support from the company is not always very good at solving issues, but they offer access to a good community of users where problems are easily solved."
"They need well-trained partners in Nigeria."
 

Pricing and Cost Advice

"For licensing, it's usually a yearly package for customers who are subscribed to Office 365, but they can also pay on a monthly basis."
"The product is expensive."
"While Microsoft Defender for Office 365 necessitates pricier E3 or E5 subscriptions, the extensive functionality offered by these licenses across various Microsoft products justifies the investment."
"From the pricing point of view, like any other product in the market, there is scope for negotiation."
"Microsoft Defender is expensive. I typically recommend it only if clients have the budget. Otherwise, I would suggest an alternative."
"The pricing has become expensive."
"Defender is a little bit more expensive as compared to others. We are in the manufacturing environment. So, we don't have a high budget for all of our endpoint devices. Its cost is a major concern for us."
"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."
"We have a two-year license subscription and the price is very high."
"The platform offers a yearly license."
"The overall price of SonicWall Email Security should be reduced and there should be an option to purchase one or two licenses more instead of their current policy of bulk increases only. There should be more flexibility in the licensing model. Each license cost approximately $33 annually."
"When compared with Cisco, it is very well priced. Cisco is very expensive."
"The cost is cheaper than Sophos. I would rate it as five out of ten."
"Our customers purchase the solution's yearly license."
"I rate the application’s pricing a five out of ten."
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Top Industries

By visitors reading reviews
Computer Software Company
11%
Manufacturing Company
10%
Financial Services Firm
8%
Comms Service Provider
7%
Construction Company
16%
Financial Services Firm
9%
Comms Service Provider
8%
Marketing Services Firm
6%
 

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 Business12
Midsize Enterprise3
Large Enterprise3
 

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.
What needs improvement with SonicWall Email Security?
Policy deployment could be time consuming and represents an area for improvement in SonicWall Email Security.
What is your primary use case for SonicWall Email Security?
SonicWall Email Security was used for security purposes, which aligns with the product's core function.
 

Also Known As

MS Defender for Office 365
Dell SonicWALL Email Security Platform, SonicWall Hosted Email Security
 

Overview

 

Sample Customers

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Star Kay White, Locala Community Partnerships
Find out what your peers are saying about Microsoft Defender for Office 365 vs. SonicWall Email Security and other solutions. Updated: November 2026.
920,769 professionals have used our research since 2012.