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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
61
Ranking in other categories
Email Archiving (1st), Email Security (2nd), Advanced Threat Protection (ATP) (2nd), Microsoft Security Suite (8th)
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 May 2026, in the Secure Email Gateway (SEG) category, the mindshare of Microsoft Defender for Office 365 is 17.0%, down from 29.5% compared to the previous year. The mindshare of Symantec Messaging Gateway is 2.6%, down from 2.7% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Secure Email Gateway (SEG) Mindshare Distribution
ProductMindshare (%)
Microsoft Defender for Office 36517.0%
Symantec Messaging Gateway2.6%
Other80.4%
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

"The product is not resource-intensive."
"Since we have started using the solution, there have been fewer compromises."
"Overall, I would rate Microsoft Defender for Office 365 at a ten."
"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 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."
"Microsoft Defender for Office 365 has decreased my time to detection and time to respond by one hundred percent."
"It’s easy to handle integrations, and we don't need a lot of people in our IT team."
"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 anti-malware and spam features are valuable."
"The stability is good; it's not buggy or glitchy, it works well, the performance is good, and they kept up with security patches."
"The setup is pretty simple."
"My advice to others who plan to use Symantec Messaging Gateway is that it's a very good product, it's very stable, and it's user-friendly, but the only problem is that it doesn't have good partner support here in Bolivia, where I'm located."
"Since Symantec Messaging Gateway is a Linux-based solution it is stable."
"The solution is a leader in anti-spam email products and you can block 99% of spam emails, making it very effective with great performance."
"I've been using Messaging Gateway for ten years."
"Symantec Messaging Gateway has a huge knowledge base about phishing, spamming, spoofing, etc."
 

Cons

"Microsoft Defender for Office 365's Mac functionality requires improvement to deliver the same level of protection found on Windows devices."
"I'd like some additional features any product can give me to protect our environment in a better way."
"I assess the stability and reliability of the solution as seven out of ten."
"Microsoft needs to broaden its global support presence by establishing teams of subject-matter experts in all regions."
"Sometimes, phishing emails manage to pass through the filter, so the system needs to enhance its phishing email detection capabilities."
"There needs to be an improvement in having the product work across multiple operating systems and have better support for non-Microsoft file types."
"The changes to customer service, specifically the new model for support agreements, are not favorable."
"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."
"The solution takes up a lot of memory."
"In a later release, it would be nice if the messaging gateway supported the cluster feature."
"Since it was purchased by Broadcomm, we've found there's been a general slide in terms of the local services we have access to and we are considering replacing them."
"Sometimes the solution picks up false positive for viruses during scans."
"If the customer has to think about budget and solutions to reduce IT cost, they should get away from Symantec and try using Microsoft."
"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."
"The biggest problem is it's an on-prem product and we're trying to get out of having equipment in data centers."
"Recently, I've had some problems regarding their support. The tech was acquired by Broadcom, and since then, the support part is very bad."
 

Pricing and Cost Advice

"It is much more expensive than using another solution because we have had to include some options and upgrade our license."
"Compared to other brands, Microsoft Defender for Office 365's pricing is competitive."
"From the pricing point of view, like any other product in the market, there is scope for negotiation."
"I know that the product is incredibly expensive."
"The pricing is normal. Considering its popularity, it's not overpriced."
"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."
"The pricing has become expensive."
"The license is expensive because the cost is based on the number of users."
"For 150 users, we pay INR 1,60,000."
"Symantec Messaging Gateway’s pricing is very cheap."
"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."
"They're a little costly compared to Microsoft."
"A subscription for technical support costs extra."
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Top Industries

By visitors reading reviews
Computer Software Company
12%
Financial Services Firm
9%
Manufacturing Company
8%
Comms Service Provider
7%
Financial Services Firm
17%
Construction Company
9%
Computer Software Company
7%
Marketing Services Firm
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 Business11
Midsize Enterprise1
Large Enterprise8
 

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.
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: April 2026.
893,311 professionals have used our research since 2012.