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Cloudflare One vs Microsoft Defender for Office 365 comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Mar 16, 2025

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

Cloudflare One
Ranking in Email Security
11th
Average Rating
8.8
Reviews Sentiment
7.3
Number of Reviews
20
Ranking in other categories
Secure Web Gateways (SWG) (7th), Data Loss Prevention (DLP) (7th), Cloud Access Security Brokers (CASB) (7th), Distributed Denial-of-Service (DDoS) Protection (5th), Access Management (5th), Bot Management (3rd), ZTNA as a Service (3rd), ZTNA (2nd), Secure Access Service Edge (SASE) (6th), Remote Browser Isolation (RBI) (2nd)
Microsoft Defender for Offi...
Ranking in Email Security
1st
Average Rating
8.4
Reviews Sentiment
7.1
Number of Reviews
49
Ranking in other categories
Advanced Threat Protection (ATP) (1st), Microsoft Security Suite (11th)
 

Mindshare comparison

As of April 2025, in the Email Security category, the mindshare of Cloudflare One is 1.6%, up from 1.3% compared to the previous year. The mindshare of Microsoft Defender for Office 365 is 13.1%, down from 19.0% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Security
 

Featured Reviews

Carlos Alam Hernandez Baruch - PeerSpot reviewer
The solution enables seamless security management and fosters a learning environment
Feedback could be enhanced. While I work efficiently with Clover as a partner in Mexico City, sometimes the information and requests are easier to manage with more concrete solutions. For the solution stopping us for e-learning, I appreciate the concept yet need more resources or courses in Mexico, preferably in Spanish. Certifications are easy, however, I require more real-world environments and instructors.
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.

Quotes from Members

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

Pros

"The solution has different options that can be used to differentiate DDoS attacks."
"Cloudflare, in my opinion, was easy to implement."
"Cloudflare Zero Trust Platform removes the risk of exposing the applications to the public."
"I'm very satisfied with the environment and the dashboard."
"It's the endpoint exposition. We don't need to expose our VPN server to the internet and need a zero-test solution. I can apply some conditional access to the endpoint that's connecting to our network to check their security policies or the security condition of their workstation. Once the workstation is trying to connect to my internal network, then I would like to check the discrete condition of these endpoints that are trying to access my internal network. We created some conditional access. We have CrowdStrike, to check if the CrowdStrike is installed, to check if it's updated, and to check for Windows updates. We created some conditional policies to check it."
"The best feature is rate limiting. If I'm expecting 500 visits per hour, Cloudflare will limit the requests if I suddenly get 50,000."
"Clover is the best product globally."
"The blocking feature is very good."
"The good part is that you don't have to configure it, which is very convenient."
"At the moment we are satisfied with this product. It's a stable, scalable, and resilient solution for us."
"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."
"The stability of Microsoft Defender for Office 365 is fantastic."
"There are several features that I consider valuable."
"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 features are safe attachments and safe links."
"One of the best features of the tool is its capability to aggregate insights from different workloads, basically from the Office 365 and endpoints part."
 

Cons

"The pricing is an area that can be improved. Pricing, as far as I recall, was the source of our problems."
"The free plan has limitations. For example, I can only set up three rules, and the application firewall is unavailable."
"The software has automated alerts, but the automated alerts are not available in the mobile app."
"Cloudflare DDoS has poor technical support."
"Our subscription plan for the solution has a limitation of bot signatures."
"Lacks a VPN feature to provide a secure connection to the data center."
"There are premium tier live service and lower tier live service, so we opted for the lower tier. But there is no medium tier where we pay a little extra and get a bit more service. So if that can be improved."
"The onboarding process can be improved a little bit."
"There's room for improvement regarding the time frame for retrieving emails."
"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."
"They can improve their security in a way where a customer can know if all their attachments are safe or not to open through a report. The solution does its job perfectly, but it never reports to the customer whether those attachments have been stopped before or not."
"The changes to customer service, specifically the new model for support agreements, are not favorable."
"Configuration requires going to a lot of places rather than just accessing one tab."
"In some situations, it has not been able to pick impersonated emails having no attachments. Technical support definitely has a scope for improvement."
"Microsoft Defender for Office 365 should be more proactive."
"We noticed that from time to time, Microsoft's stability does have problems. Sometimes the service goes up and down. Sometimes they change without prior notice."
 

Pricing and Cost Advice

"The solution's pricing lacks transparency."
"The pricing is somewhere in the middle. I would rate the pricing a seven out of ten."
"My company has to make yearly payments towards the licensing costs attached to the solution. There are no hidden charges apart from the licensing costs of the solution."
"The solution is not that expensive."
"The pricing of the solution is cheap. The licensing cost is also very low. I rate the cost and pricing a three out of ten."
"Cloudflare Zero Trust Platform's pricing is good."
"The prices are slightly expensive."
"The price tag is no longer $200,000, but rather $300,000 to $400,000. It's twice."
"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."
"Microsoft Defender is expensive. I typically recommend it only if clients have the budget. Otherwise, I would suggest an alternative."
"The solution could be better by simplifying the business model of their licensing. It was hard to figure out how to get the licensing done for the environment, initially."
"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."
"I know that the product is incredibly expensive."
"I was working in the government and it was too expensive for us to use our Microsoft products."
"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."
"Compared to other brands, Microsoft Defender for Office 365's pricing is competitive."
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Top Industries

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

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

Questions from the Community

What do you like most about Cloudflare Access?
The tool also offers good scalability, and the dashboard, along with real-time analytics, is very good.
What is your experience regarding pricing and costs for Cloudflare Access?
The price of Cloudflare Access is the same as compared to Akamai, but I get better performance from Cloudflare. My company has to make yearly payments towards the licensing costs attached to the so...
What needs improvement with Cloudflare Access?
Cloudflare Access has strong integration with Microsoft, among other platforms. However, when it comes to Kaspersky, we have clients who typically encounter challenges. The usual setup involves con...
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...
What is your experience regarding pricing and costs for Microsoft Defender for Office 365?
Money-wise, it is a part of the Office 365 ( /products/office-365-reviews ) suite, making it slightly more expensive compared to Trend Micro. Although Defender is free, you have to pay separately f...
What needs improvement with Microsoft Defender for Office 365?
The main area for improvement is simplifying the implementation and rollout process. There are many conditions to be met, making it challenging to ensure every system is protected. Troubleshooting ...
 

Also Known As

Cloudflare Area 1 Email Security, Cloudflare Bot Management, Cloudflare Gateway, Cloudflare Zero Trust Platform, Cloudflare DDoS, Cloudflare SASE & SSE Platform
MS Defender for Office 365
 

Overview

 

Sample Customers

23andMe
Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Find out what your peers are saying about Cloudflare One vs. Microsoft Defender for Office 365 and other solutions. Updated: April 2025.
848,716 professionals have used our research since 2012.