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Microsoft Defender for Office 365 vs Symantec Messaging Gateway 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 Secure Email Gateway (SEG)
1st
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
60
Ranking in other categories
Email Archiving (1st), Email Security (1st), Advanced Threat Protection (ATP) (2nd), Microsoft Security Suite (10th)
Symantec Messaging Gateway
Ranking in Secure Email Gateway (SEG)
12th
Average Rating
8.2
Reviews Sentiment
6.8
Number of Reviews
20
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of January 2026, in the Secure Email Gateway (SEG) category, the mindshare of Microsoft Defender for Office 365 is 24.2%, down from 31.1% compared to the previous year. The mindshare of Symantec Messaging Gateway is 2.5%, down from 3.0% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Secure Email Gateway (SEG) Market Share Distribution
ProductMarket Share (%)
Microsoft Defender for Office 36524.2%
Symantec Messaging Gateway2.5%
Other73.3%
Secure Email Gateway (SEG)
 

Q&A Highlights

CO
IT System Administrator at Rochester Public Utilities
Dec 09, 2022
 

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.
Girish Vijay - PeerSpot reviewer
Deputy Manager IT at Carl Bechem Lubricants India Pvt. Ltd.
A stable and reasonably priced solution that performs well and has a very good malware database
Since Symantec merged with Broadcom, they might have lost some good technical engineers. Maybe that’s the reason why the product is performing poorly. When we have a good marketing and sales team, even though our product cannot perform, we will sell it at a high price because of the buzzwords. However, at the end of the day, the product should perform. Most of the products might not perform. Symantec is a very good product, but the services are basic. I rate the technical features of the product a nine out of ten. However, I would rate the services provided by the solution a six out of ten. Overall, I rate the tool an eight out of ten.

Quotes from Members

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

Pros

"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."
"Defender for Office 365 has helped eliminate having to look at multiple dashboards and that is the aspect I like most about it. It is simpler, effective, and convenient. The users like the process efficiency."
"The benefit that stands out to me is the ability for multiple individuals to collaborate simultaneously within the same document. Additionally, there is the option to save the document directly in the integrated OneDrive or SharePoint."
"At the moment we are satisfied with this product. It's a stable, scalable, and resilient solution for us."
"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."
"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."
"Microsoft Defender for Office 365's most valuable feature is its performance."
"The most valuable feature of Microsoft Defender for Office 365 is its spam filter."
"Symantec is a secure product."
"Symantec Messaging Gateway has a huge knowledge base about phishing, spamming, spoofing, etc."
"Symantec’s spyware and malware signature database is very good compared to other products."
"Symantec Messaging Gateway has a good GUI, and it is very powerful in detecting viruses and spam."
"What I like most about Symantec Messaging Gateway is its usability. I also find its interface very friendly. The solution has a very good interface."
"The cloud-based interface is very user-friendly."
"The most valuable features of Symantec Messaging Gateway are advanced content filtering, malware, and antivirus defense."
"I like that it's simple and easy to configure, deploy, and manage. The reporting function has all the features we're looking for, and we are fine with that."
 

Cons

"Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published."
"The changes to customer service, specifically the new model for support agreements, are not favorable."
"The XDR dashboard has room for improvement."
"We need to be able to whitelist data at the backend."
"Configuring the default strategies and policies in Microsoft Defender for Cloud Apps generates a lot of noise and false positives."
"Specifically, within Microsoft Defender for Office 365, I want it to improve the DLP capabilities."
"I'd like some additional features any product can give me to protect our environment in a better way."
"It would be better if it were more scalable. It depends on the architecture, but we would like to make it more scalable for both data centers."
"It could be more scalable."
"The product must improve the user dashboards."
"The solution takes up a lot of memory."
"What needs to be improved in Symantec Messaging Gateway is its local partner support, as it's not as technical. The support my company gets from the partner isn't good. Vendor support is good, but local partner support isn't. I'm happy with Symantec Messaging Gateway as a solution, but the problem is with its partner support. To me, Symantec Messaging Gateway is a complete solution, but it can be very difficult to search the web for resolutions to issues or problems you experience from it. If this could be improved or resolved in the next release of Symantec Messaging Gateway, then that would be good."
"The false positive submissions must be improved."
"The solution interface is from 2003 and is outdated. Symantec Messaging Gateway needs to update the interface."
"Sometimes the solution picks up false positive for viruses during scans."
"What's lacking when you compare it with Proofpoint and other threat protection solutions is that it does the basic stuff, but we need more advanced threat handling."
 

Pricing and Cost Advice

"The pricing has become expensive."
"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."
"I was working in the government and it was too expensive for us to use our Microsoft products."
"It is much more expensive than using another solution because we have had to include some options and upgrade our license."
"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."
"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."
"For large enterprise organizations, they can definitely afford it, but for small and medium organizations, they might struggle to cover the expenses."
"I know that the product is incredibly expensive."
"A subscription for technical support costs extra."
"They're a little costly compared to Microsoft."
"Symantec Messaging Gateway’s pricing is very cheap."
"For 150 users, we pay INR 1,60,000."
"It's a bit expensive compared to its competitor Barracuda Email Security Gateway but cheaper than Sophos Email."
"The cost of Symantec Messaging Gateway is too expensive in general. However, the appliance also includes the price of the license in the same bundle."
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Top Industries

By visitors reading reviews
Computer Software Company
14%
Financial Services Firm
8%
Manufacturing Company
8%
Comms Service Provider
6%
Financial Services Firm
18%
Computer Software Company
10%
Manufacturing Company
8%
Government
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business23
Midsize Enterprise10
Large Enterprise31
By reviewers
Company SizeCount
Small Business11
Midsize Enterprise1
Large Enterprise8
 

Questions from the Community

What needs improvement with Microsoft Defender for Office 365?
The inbuilt analysis of false positives can be faster. It's not slow, but it can be faster.
What is your primary use case for Microsoft Defender for Office 365?
My use case for Microsoft Defender for Office 365 is for email protection, safe links, protection of links, documents, protecting my documents, and protecting attachments. I also use it to conduct ...
Ask a question
Earn 20 points
 

Also Known As

MS Defender for Office 365
Symantec.cloud, Symantec Email Security.cloud
 

Overview

 

Sample Customers

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Doric, Joblink Plus, Our Lady of Mercy College, Parramatta, PPB Advisory, Slater & Gordon Lawyers, Sydney Adventist Hospital Ltd.
Find out what your peers are saying about Microsoft Defender for Office 365 vs. Symantec Messaging Gateway and other solutions. Updated: December 2025.
881,082 professionals have used our research since 2012.