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Microsoft Defender for Office 365 vs Trend Micro Deep Discovery Email Inspector comparison

Microsoft and Trend Micro are both solutions in the Email Security category. Microsoft is ranked #1 with an average rating of 8.5, while Trend Micro is ranked #23 with an average rating of 8.7. Microsoft holds a 11.4% mindshare in Email Security, compared to Trend Micro’s 0.5% mindshare. Additionally, 96% of Microsoft users are willing to recommend the solution, compared to 100% of Trend Micro users who would recommend it.
Microsoft Defender for Offi...
Read 53 Microsoft Defender for Office 365 reviews
  • 15,029 Views
  • 10,520 Comparison Views
96% willing to recommend
Trend Micro Deep Discovery ...
Read 8 Trend Micro Deep Discovery Email Inspector reviews
  • 1,307 Views
  • 850 Comparison Views
100% willing to recommend
 

Comparison Buyer's Guide

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Executive SummaryUpdated on Dec 3, 2024

Trend Micro Deep Discovery Email Inspector and Microsoft Defender for Office 365 are competing products, both providing advanced threat protection for email security. Microsoft Defender for Office 365 is perceived as having the upper hand due to its extensive features and integration within the Microsoft ecosystem, making it a preferred solution for enhanced security.

Features: Trend Micro Deep Discovery Email Inspector offers features such as simple analysis of phishing emails, a user-friendly UI for email detection, and visibility into the network with fast sandboxing technology. On the other hand, Microsoft Defender for Office 365 provides features like URL Threat Protection, anti-malware capabilities, data loss prevention policies, and Threat Explorer for real-time security attack analysis.

Room for Improvement: Trend Micro could enhance its response time for alerts, improve sandboxing efficiencies, and refine user interface elements for more streamlined operation. Microsoft Defender for Office 365 may benefit from simplifying threat configuration processes, enhancing information protection for different cloud services, and improving response times for phishing attacks.

Ease of Deployment and Customer Service: Trend Micro offers flexible deployment options tailored to various infrastructures and is noted for its responsive support services. Microsoft Defender enjoys smooth integration within Microsoft environments, simplifying deployment but may not offer the same personalized support level that Trend Micro provides, despite its broader reach.

Pricing and ROI: Trend Micro Deep Discovery Email Inspector is recognized for a more favorable setup cost structure, leading to a better initial ROI. However, Microsoft Defender for Office 365 might entail a higher upfront investment but offers a comprehensive security package that can justify the expense over time through reduced risk exposure and increased productivity, balancing initial costs against the capabilities offered.

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To learn more, read our detailed Microsoft Defender for Office 365 vs. Trend Micro Deep Discovery Email Inspector Report (Updated: September 2025).
Buyer's Guide
Microsoft Defender for Office 365 vs. Trend Micro Deep Discovery Email Inspector
September 2025
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Helped 869,513 peers since 2012

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
1st
Average Rating
8.4
Reviews Sentiment
6.9
Number of Reviews
53
Ranking in other categories
Email Archiving (1st), Advanced Threat Protection (ATP) (2nd), Microsoft Security Suite (10th), Secure Email Gateway (SEG) (1st)
Trend Micro Deep Discovery ...
Ranking in Email Security
23rd
Average Rating
7.8
Reviews Sentiment
7.1
Number of Reviews
8
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of October 2025, in the Email Security category, the mindshare of Microsoft Defender for Office 365 is 11.4%, down from 14.8% compared to the previous year. The mindshare of Trend Micro Deep Discovery Email Inspector is 0.5%, up from 0.2% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Security Market Share Distribution
ProductMarket Share (%)
Microsoft Defender for Office 36511.4%
Trend Micro Deep Discovery Email Inspector0.5%
Other88.1%
Email Security
 

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.
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Bilal Saleem - PeerSpot reviewer
Reliability and threat intelligence make this solution competitive, but AI improvements can further enhance its effectiveness
The best features of Trend Micro Deep Discovery Email Inspector include its reliability. The second valuable feature is its built-in sandbox feature, allowing for inspection of incoming emails and attachments. The sandbox is an appliance that opens any attachment in an enclosed environment to assess its impact and potential for viruses. This protects the network from harmful threats. Trend Micro has a very large R&D team with excellent threat intel, allowing them to provide better solutions than some competitors. They understand emerging threats based on the information from their EDR. The key strengths can be summarized as reliability, a good integrated one-box solution that includes a sandbox, and their R&D capabilities and good ratings, which lead to better threat intelligence. The detailed threat intelligence provided by Trend Micro Deep Discovery Email Inspector is valuable in understanding the behavior and tactics of potential email threats.
Read full review

Quotes from Members

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

Pros

"My experience deploying Microsoft Defender for Office 365 was seamless."
"Safe attachments, safe links, policies, and the ability to protect from zero-day threats are the most valuable features."
"The most valuable aspect of Microsoft Defender for Office 365 is its ability to protect us from malware."
"I would say that 90% of the spam and phishing attack emails get blocked right off the bat."
"Microsoft Defender for Office 365's most valuable feature is its performance."
"The initial setup is straightforward. You just add the license, click it, and then you can set up the rules. It is quite simple."
"The email protection is excellent, especially in terms of anti-phishing policies."
"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."
More Microsoft Defender for Office 365 pros
"The best features of Trend Micro Deep Discovery Email Inspector include its reliability."
"The most valuable feature of Trend Micro Deep Discovery Email Inspector is the simple analysis of phishing emails."
"I would rate the solution's stability at ten out of ten."
"It can effectively monitor outbound and inbound devices."
"I like that it is very user-friendly and easy to install."
"Trend Micro is a very good product."
"I find Trend Micro to be a good solution for security purposes."
"I highly recommend Trend Micro Deep Discovery Email Inspector due to its security and scalability features."
More Trend Micro Deep Discovery Email Inspector pros
 

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 some situations, it has not been able to pick impersonated emails having no attachments. Technical support definitely has a scope for improvement."
"About eight months ago, we started to measure the quantity of phishing and spam that we have been receiving, and it has been increasing a lot. That means that protection for our email is not as good as we were expecting."
"There needs to be an improvement in integrating the product to work across multiple operating systems, and to have better support for non-Microsoft file types."
"Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published."
"Specifically, within Microsoft Defender for Office 365, I want it to improve the DLP capabilities."
"The product must provide better malware detection."
"Microsoft Defender for Office 365 should be more proactive."
More Microsoft Defender for Office 365 cons
"Trend Micro's technical support has room for improvement. More efficient support should be provided, especially for standard support."
"The product's feature for message processing and blocking devices for bulk emails needs improvement."
"I would like to be able to send emails to a specific sandbox. This is a feature I would like to see added to the next release."
"The dashboard could be improved to match the quality of Check Point Harmony's dashboard."
"It could be more user-friendly, easier to install, and lighter on the network. I would say that for all products because you do not need technical expertise to take care of it. When you have a user-friendly solution, it makes it easier for the vendors or companies like us. We do not have to go to the client's site to attend to issues all the time. Because it is user-friendly, they can take care of it after some training."
"Trend Micro Deep Discovery Email Inspector could improve by making it easier to use. Microsoft solutions are easier to use."
"Trend Micro's technical support has room for improvement."
"To improve Trend Micro Deep Discovery Email Inspector, it should have updates with better AI and ML-based integration."
More Trend Micro Deep Discovery Email Inspector cons
 

Pricing and Cost Advice

"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."
"I know that the product is incredibly expensive."
"For large enterprise organizations, they can definitely afford it, but for small and medium organizations, they might struggle to cover the expenses."
"Microsoft Defender for Office 365 comes with Microsoft Windows. It is free with the operating system."
"It's a user-base subscription."
"It is much more expensive than using another solution because we have had to include some options and upgrade our license."
"The product is expensive."
"I was working in the government and it was too expensive for us to use our Microsoft products."
More Microsoft Defender for Office 365 pricing and cost advice
"We pay for an annual subscription for this email security solution."
"The solution's pricing is high, and I would rate it an eight out of ten."
"The price of Trend Micro Deep Discovery Email Inspector is less expensive than Microsoft solutions."
"It's an expensive solution, and you may not see a return on investment in a short period of time. However, you will see a return over a long period of time."
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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%
Performing Arts
13%
Computer Software Company
11%
Financial Services Firm
9%
Outsourcing Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business23
Midsize Enterprise8
Large Enterprise27
By reviewers
Company SizeCount
Small Business5
Midsize Enterprise2
Large Enterprise1
 

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...
See all answers
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.
See all answers
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...
See all answers
What is your experience regarding pricing and costs for Trend Micro Deep Discovery Email Inspector?
On the pricing side, Trend Micro Deep Discovery Email Inspector is not the cheapest, but it's not the highest either. Its prices are around 80%, which is lesser than some vendors but higher than most.
See all answers
What needs improvement with Trend Micro Deep Discovery Email Inspector?
To improve Trend Micro Deep Discovery Email Inspector, it should have updates with better AI and ML-based integration. While it has some capabilities in this area, focusing more on this aspect coul...
See all answers
What is your primary use case for Trend Micro Deep Discovery Email Inspector?
The main use case for using Trend Micro Deep Discovery Email Inspector is for the anti-spam solution. Different enterprises get spam emails from multiple sources, so the use case for customers is t...
See all answers
 

Comparisons

Proofpoint Email Protection vs Microsoft Defender for Office 365 Logo
Proofpoint Email Protection vs Microsoft Defender for Office 365
Compared 12% of the time
Mimecast Email Security vs Microsoft Defender for Office 365 Logo
Mimecast Email Security vs Microsoft Defender for Office 365
Compared 7% of the time
Barracuda Email Protection vs Microsoft Defender for Office 365 Logo
Barracuda Email Protection vs Microsoft Defender for Office 365
Compared 6% of the time
Check Point Harmony Email & Collaboration vs Microsoft Defender for Office 365 Logo
Check Point Harmony Email & Collaboration vs Microsoft Defender for Office 365
Compared 6% of the time
Microsoft Defender for Business vs Microsoft Defender for Office 365 Logo
Microsoft Defender for Business vs Microsoft Defender for Office 365
Compared 5% of the time
More Microsoft Defender for Office 365 Competitors
Trend Micro InterScan Messaging Security vs Trend Micro Deep Discovery Email Inspector Logo
Trend Micro InterScan Messaging Security vs Trend Micro Deep Discovery Email Inspector
Compared 84% of the time
Trend Micro ScanMail vs Trend Micro Deep Discovery Email Inspector Logo
Trend Micro ScanMail vs Trend Micro Deep Discovery Email Inspector
Compared 16% of the time
More Trend Micro Deep Discovery Email Inspector Competitors
 

Product Reports

Buyer's Guide
Microsoft Defender for Office 365
September 2025
Microsoft Defender for Office 365 reportDownload Microsoft Defender for Office 365 product report
Buyer's Guide
Email Security
September 2025
Trend Micro Deep Discovery Email Inspector reportDownload Trend Micro Deep Discovery Email Inspector product report
 

Also Known As

MS Defender for Office 365
Deep Discovery Email Inspector
 

Overview

Microsoft Defender for Office 365 is a comprehensive security solution designed to protect organizations against advanced threats in their email, collaboration, and productivity environments. It combines the power of Microsoft's threat intelligence, machine learning, and behavioral analytics to provide real-time protection against phishing, malware, ransomware, and other malicious attacks.

With Microsoft Defender for Office 365, organizations can safeguard their email communication by detecting and blocking malicious links, attachments, and unsafe email content. It employs advanced anti-phishing capabilities to identify and prevent sophisticated phishing attacks that attempt to steal sensitive information or compromise user credentials.

This solution also offers robust protection against malware and ransomware. It leverages machine learning algorithms to analyze email attachments and URLs in real-time, identifying and blocking malicious content before it reaches users' inboxes. Additionally, it provides advanced threat-hunting capabilities, allowing security teams to proactively investigate and respond to potential threats.

Microsoft Defender for Office 365 goes beyond email protection and extends its security features to other collaboration tools like SharePoint, OneDrive, and Teams. It scans files and documents stored in these platforms, ensuring that they are free from malware and other malicious content. It also provides visibility into user activities, helping organizations detect and mitigate insider threats.

Furthermore, this solution offers rich reporting and analytics capabilities, providing organizations with insights into their security posture and threat landscape. It enables security administrators to monitor and manage security incidents, track trends, and take proactive measures to enhance their overall security posture.

Microsoft

Stop spear phishing attacks and targeted ransomware

Trend Micro
 

Sample Customers

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Bank Saint Petersburg, CEITEC S.A., Dar Al-Handasah, Mitsubishi Electric Information Systems, Motilal Oswal Financial Services Ltd, OKWAVE, Oman Arab Bank, VakifBank
Buyer's Guide
Microsoft Defender for Office 365 vs. Trend Micro Deep Discovery Email Inspector
September 2025
Free Report: Microsoft Defender for Office 365 vs. Trend Micro Deep Discovery Email Inspector
Find out what your peers are saying about Microsoft Defender for Office 365 vs. Trend Micro Deep Discovery Email Inspector and other solutions. Updated: September 2025.
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