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Mimecast Email and Collaboration Threat Protection vs Zscaler Internet Access comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Feb 11, 2026

Review summaries and opinions

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

ROI

Sentiment score
4.7
iboss offers significant ROI by saving bandwidth and enhancing security, despite increased costs from cloud migration and device pricing.
Sentiment score
5.5
Mimecast Advanced Email Security is valued for robust protection despite challenges in quantifying ROI and gaps in support and stability.
Sentiment score
5.7
Zscaler Internet Access drives cost savings by reducing on-premises needs, enhancing security, and cutting hardware and staffing costs.
With iboss, whenever you turn on your laptop, the iboss agent automatically connects to the iboss cloud, enforcing all security policies. So with respect to the security side, it strengthens measures.
Senior Consultant Proxy Engineering at a financial services firm with 10,001+ employees
I have seen some cost effectiveness from iboss; it has reduced certain support requirements, making it a more hands-off solution.
Managing Director
There is definitely a return on investment when using Mimecast, as it blocks phishing emails, reducing the risk of significant financial losses.
Senior Tech. Lead at WE
The managed service aspect of Zscaler Internet Access has allowed for reduced staffing costs, resulting in a saving of approximately 20-25% compared to prior expenses.
Principle Cloud Architect at a tech services company with 11-50 employees
 

Customer Service

Sentiment score
7.8
Iboss support is praised for responsiveness and knowledge, with some concerns about communication but generally favorable reviews.
Sentiment score
5.6
Mimecast Advanced Email Security's technical support receives varied feedback, highlighting promptness, knowledge, but some issues with responsiveness and personalization.
Sentiment score
6.5
Zscaler Internet Access customer service is responsive and knowledgeable, with high ratings but occasional scheduling and resource issues.
They are very fast, responsive, and knowledgeable.
Head of Cybersecurity at SES Water
The quality of the support is fantastic.
Educational Technology Coordinator at a performing arts with 201-500 employees
We had promising discussions about resolving these issues, but no real action followed.
Network Administrator at a educational organization with 51-200 employees
Support personnel are hesitant to engage in remote sessions, preferring to share documentation via email.
Senior Tech. Lead at WE
Mimecast technical support is generally quite good.
Information Security Analyst at Enfield Central Library
I would rate my experience with technical support of Mimecast Email Security between seven and eight out of ten for their support.
Email Security Engineer at Logic Infosecurity
The technical support for Zscaler Internet Access is rated around seven out of ten due to some response time issues and the engagement model.
Principle Cloud Architect at a tech services company with 11-50 employees
Zscaler Internet Access customer service is really very good.
Product Owner at a financial services firm with 501-1,000 employees
I find customer support to be quite adequate
Group IT Manager at a wholesaler/distributor with 10,001+ employees
 

Scalability Issues

Sentiment score
7.3
Iboss efficiently scales to meet growing resource demands, supporting large user bases with robust support and adaptable infrastructure.
Sentiment score
7.0
Mimecast Advanced Email Security is highly adaptable, scalable, and rated highly for flexibility and user handling across diverse sectors.
Sentiment score
7.2
Zscaler Internet Access offers scalable cloud solutions for easy expansion, with some challenges in cost, bandwidth, and deployment complexity.
They are also able to meet on-demand requirements based on your contract with them, and can easily provide adequate resources and scalability.
Senior Consultant Proxy Engineering at a financial services firm with 10,001+ employees
I would rate it a nine out of ten for scalability.
If I start seeing sluggishness or anything like that, I just reach out to my rep, and they connect with their dev team, typically resolving it the same day.
Educational Technology Coordinator at a performing arts with 201-500 employees
If Mimecast Email Security introduces API solutions, it will dominate the market.
Email Security Engineer at Logic Infosecurity
From what I've seen from the MSP, it seems quite complicated to manage the configuration itself.
IT Manager at a logistics company with 201-500 employees
With the pricing structure that they currently have, it is only for big customers.
Product Owner at a financial services firm with 501-1,000 employees
I find Zscaler Internet Access to be highly scalable, which was one of the reasons for choosing it.
Group IT Manager at a wholesaler/distributor with 10,001+ employees
Zscaler Internet Access is scalable and has points of presence across the globe to ensure low latency and reliable connections.
Principle Cloud Architect at a tech services company with 11-50 employees
 

Stability Issues

Sentiment score
7.6
Iboss is generally stable with reliable support, despite initial deployment challenges, and is often praised for minimal downtime.
Sentiment score
7.5
Mimecast Advanced Email Security is stable and reliable, with occasional login issues and rare performance interruptions reported by users.
Sentiment score
7.4
Zscaler Internet Access is globally stable and secure, with minor regional latency issues, and straightforward deployment praised by users.
It's been pretty solid; I've never had an outage with them, and if I ever had, it's only been once out of the seven years.
Educational Technology Coordinator at a performing arts with 201-500 employees
We've experienced zero downtime.
Head of Cybersecurity at SES Water
Our biggest problem with their service was it did not recognize the device despite our ClearPass sending information to the iboss box.
Network Administrator at a educational organization with 51-200 employees
They confirm it's a good solution where only one or two rare emails get through, while the rest are properly blocked without any issues.
Email Security Engineer at Logic Infosecurity
The issues we did have were causing quite a lot of problems.
IT Manager at a logistics company with 201-500 employees
Zscaler Internet Access is stable and capable of building resilient architectures.
Principle Cloud Architect at a tech services company with 11-50 employees
Zscaler Internet Access is very stable, and I would rate its stability as nine out of ten.
Group IT Manager at a wholesaler/distributor with 10,001+ employees
 

Room For Improvement

Iboss struggles with Mac support, ISP integration in India, and needs improvements in security features and cloud integration.
Mimecast Advanced Email Security is criticized for complex installation, costly pricing, and numerous functionality and support issues.
Zscaler Internet Access needs improved integration, reporting, user interface, support, pricing, scalability, and feature enhancements for better overall performance.
It is not as intuitive as the rest of the platform.
Head of Cybersecurity at SES Water
We also had a problem with a transition when we upgraded from one appliance of theirs to another, but their engineer lost a good deal of our data.
Network Administrator at a educational organization with 51-200 employees
Our iboss subscription access should be more secure with an OTP or VPN etc.
A lot of emails were missed despite being known samples.
Senior Tech. Lead at WE
Mimecast Email Security is somewhat expensive compared to the competition in the Indian market.
Co-Founder & VP-Sales at QuantumShield Technologies LLP
We discussed the phishing aspect, the DNS system, and the key rotation.
Senior Security Engineer at ManpowerGroup
The response time and engagement model for technical support could be improved to handle complex outages more efficiently.
Principle Cloud Architect at a tech services company with 11-50 employees
In future updates, I would like to see some of the features bundled into the existing product set, perhaps more AI features and a refreshed interface.
Cyber Security Architect at a manufacturing company with 1,001-5,000 employees
Zscaler Internet Access has introduced AI control for tools such as ChatGPT, providing options to restrict to text-only input without file or image uploads through CASB restriction controls.
Associate Vice President at Novac Technology Solutions
 

Setup Cost

Iboss offers competitive, transparent pricing with valuable cloud solutions, appealing to enterprises for predictable budgeting and desired functionality.
Enterprise buyers view Mimecast's email security as costly, with subscription fees per user and competitors like Microsoft Defender more affordable.
Zscaler Internet Access pricing is high, with a per-user model, making it cost-effective yet potentially inaccessible for small businesses.
It offers the same features you would get from a vendor that charges 250,000 British pounds for a fraction of the price.
Head of Cybersecurity at SES Water
The following year, the cost of just licensing was similar to what was paid the previous year for a new appliance along with the implementation and licensing costs.
Network Administrator at a educational organization with 51-200 employees
Regarding pricing, setup costs, and licensing, iboss is not cheap, and that's my only concern.
Managing Director
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
Senior Tech. Lead at WE
Regarding the price, I think that in terms of similar products, it is pretty much in the same line, so I think it's reasonable.
IT Manager at a logistics company with 201-500 employees
Zscaler Internet Access is recognized as an expensive solution.
Group IT Manager at a wholesaler/distributor with 10,001+ employees
Zscaler Internet Access is less expensive than competitors like Palo Alto, offering a premium service justified by security enhancements and cost-effective scalability.
Principle Cloud Architect at a tech services company with 11-50 employees
Of course, it is an expensive product.
Product Owner at a financial services firm with 501-1,000 employees
 

Valuable Features

Iboss provides comprehensive cloud security with advanced features, enhancing data protection and management efficiency for network security.
Mimecast Advanced Email Security provides comprehensive protection, easy integration, user-friendly setup, and valuable insights for enhanced email security.
Zscaler Internet Access enhances security with URL filtering, SSL inspection, threat protection, and seamless remote management, improving efficiency globally.
The solution's mental health function can detect if someone needs help.
Head of Cybersecurity at SES Water
It's given us a lot more visibility into our computer assets that may be infected with viruses and also shows us people who have unusually large uploads or might be engaging in high-risk activities, such as searches or going to sites not categorized by their web crawler.
Educational Technology Coordinator at a performing arts with 201-500 employees
iboss was the best solution for us because, no matter what domain you were in, everything is under a single pane of glass, which is exactly what we wanted.
Managing Director
A distinct advantage of Mimecast is its ability to block phishing and impostor attacks, which are significant threats currently.
Senior Tech. Lead at WE
One of the most useful features is the threat remediation module, which can be used to remove malicious emails that may have been delivered or manually remove them.
Information Security Analyst at Enfield Central Library
Mimecast Email Security includes the best gateway solution across all Cisco, Trend Micro, and other solutions.
Email Security Engineer at Logic Infosecurity
It prevents numerous web attacks through its AI/ML incorporated capability which identifies malware, threats, and viruses.
Associate Vice President at Novac Technology Solutions
Zscaler Internet Access has positively impacted my organization by reducing the dependency on on-premises hardware and improving security posture, enabling faster user onboarding, and providing better performance for remote users.
Senior Network Engineer at Anthology
The most valuable feature for me is the ability to see how my network and traffic looks with modules like analytics and insights.
Group IT Manager at a wholesaler/distributor with 10,001+ employees
 

Categories and Ranking

iboss
Sponsored
Ranking in Secure Web Gateways (SWG)
6th
Average Rating
8.4
Reviews Sentiment
6.9
Number of Reviews
22
Ranking in other categories
Internet Security (3rd), Web Content Filtering (1st), Cloud Access Security Brokers (CASB) (7th), ZTNA as a Service (8th), Secure Access Service Edge (SASE) (8th)
Mimecast Email and Collabor...
Ranking in Secure Web Gateways (SWG)
15th
Average Rating
8.0
Reviews Sentiment
5.9
Number of Reviews
39
Ranking in other categories
Email Archiving (2nd), Office 365 Protection (2nd), Secure Email Gateway (SEG) (3rd)
Zscaler Internet Access
Ranking in Secure Web Gateways (SWG)
3rd
Average Rating
8.4
Reviews Sentiment
6.6
Number of Reviews
59
Ranking in other categories
Internet Security (2nd)
 

Mindshare comparison

As of May 2026, in the Secure Web Gateways (SWG) category, the mindshare of iboss is 3.3%, up from 2.0% compared to the previous year. The mindshare of Mimecast Email and Collaboration Threat Protection is 0.6%, up from 0.4% compared to the previous year. The mindshare of Zscaler Internet Access is 10.3%, down from 14.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Secure Web Gateways (SWG) Mindshare Distribution
ProductMindshare (%)
Zscaler Internet Access10.3%
iboss3.3%
Mimecast Email and Collaboration Threat Protection0.6%
Other85.8%
Secure Web Gateways (SWG)
 

Featured Reviews

Ashok Ananthula - PeerSpot reviewer
Senior Consultant Proxy Engineering at a financial services firm with 10,001+ employees
Cloud gateway has strengthened remote web security and now needs better Mac and ISP support
The problem our organization had is that iboss failed for the Mac devices. It is not able to give a successful agent for the Mac agents. That is where in 2025, we had to migrate to the Palo Alto-based platform. If your use case is for just Windows laptops,you can consider this platform as an option One issue is the data center resiliency part. In India especially, they are not tied up with the Tier 1 ISPs like Tata or Airtel; they were having Tier 2 ISPs and encountered many issues reaching few major sites that my organization depends on, and they were having problems that they could not fix quickly. They also lack a mechanism to route that traffic within their data center; rather, they ask customers to make a pac file change to route it to Singapore explicitly. It would be better if they route from their backend , i mean even if I send it to India DC, they should be able to route it internally to make that work; however, they fail to do that and ask the customer to route it in the pac file. Another suggestion is that in China, they do not have the proper setup; they used to have numerous problems with slowness and lack of premium circuits in China as well. That leads to multiple sites working slowly with latency-related issues. So the main issue is the ISP-related problems that need to be solved.
HS
Email Security Engineer at Logic Infosecurity
Experience high detection and user-friendly policies with reliable email security implementation
The system is not user-friendly because you have to create policies that are mapped in a dictionary. As an IT engineer, I understand how it works, but explaining it to another IT person can be difficult. Having more user-friendly dashboards would improve the work experience. In Mimecast Email Security, checking policies in the dictionary or gateway is very complicated, and not everyone understands this process. If you examine the Check Point portal, it's user-friendly with easily accessible tabs that anyone can explore. With Mimecast Email Security, making changes might impact existing mailboxes. The portal is complicated compared to Check Point's user-friendly interface.
Mohan Janarthanan - PeerSpot reviewer
Associate Vice President at Novac Technology Solutions
User access management and threat prevention are enhanced with user-friendly controls
The best features Zscaler Internet Access offers include application control, tenant segregation, and PoP center regions which have low availability zones. The internet access is very successful and bandwidth speed is excellent. It also has application-based control, URL-based control, and SSL inspection capabilities, which are very useful. Additionally, the in-depth CASB segregation is very beneficial to us. One unique feature I found helpful is the tenant level restrictions, which we use to only access our organization's tenant level mail IDs, drives, and specific tenant level access while restricting public access. Zscaler Internet Access has positively impacted our organization as we have noticed substantial outputs and income. It has improved our security environment control and endpoint protection. It prevents numerous web attacks through its AI/ML incorporated capability which identifies malware, threats, and viruses. It has a toggle button to enable features entirely at the tenant level for all users onboarded into Zscaler Internet Access, resulting in much better outcomes.
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Use our free recommendation engine to learn which Secure Web Gateways (SWG) solutions are best for your needs.
894,738 professionals have used our research since 2012.
 

Top Industries

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

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business6
Midsize Enterprise7
Large Enterprise8
By reviewers
Company SizeCount
Small Business19
Midsize Enterprise11
Large Enterprise13
By reviewers
Company SizeCount
Small Business17
Midsize Enterprise9
Large Enterprise38
 

Questions from the Community

What needs improvement with iboss?
The problem our organization had is that iboss failed for the Mac devices. It is not able to give a successful agent ...
What is your primary use case for iboss?
We used iBoss mainly for Internet Access by having an Agent on Windows laptops Primarily because when we try to use i...
What is your experience regarding pricing and costs for iboss?
I am not involved in pricing, but as per the information I have, during that time, the Blue Coat proxies we were usin...
What needs improvement with Mimecast Email Security with Targeted Threat Protection?
There is room for improvement since new threats are emerging. Considering the availability of new features would be w...
Which is the better security solution - Cisco Umbrella or Zscaler?
Cisco Umbrella and Zscaler Internet Access are two broad-spectrum Internet security solutions that I have tried. Zs...
Which is better, Zscaler internet access or Netsckope CASB?
We researched Netskope but ultimately chose Zscaler. Netskope is a cloud access security broker that helps identify ...
What is your experience regarding pricing and costs for Zscaler Internet Access?
It is only for big companies currently and they only focus on that. That is one of the problems to get into the marke...
 

Also Known As

iBoss Cloud Platform
Mimecast Email Security with Targeted Threat Protection, Mimecast Web Security, Mimecast Mailbox Continuity, Mimecast Advanced Email Security
ZIA
 

Overview

 

Sample Customers

More than 4,000 global enterprises trust the iboss Cloud Platform to support their modern workforces, including a large number of Fortune 50 companies.
Azizi Developments, Affinity Credit Union, Aftercare, Al Abbar Group
Ulster-Greene ARC, BanRegio, HDFC, Ralcorp Holdings Inc., British American Tobacco, Med America Billing Services Inc., Lanco Group, Aquafil, Telefonica, Swisscom, Brigade Group
Find out what your peers are saying about Mimecast Email and Collaboration Threat Protection vs. Zscaler Internet Access and other solutions. Updated: April 2026.
894,738 professionals have used our research since 2012.