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ProtonMail vs Zimbra Collaboration 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

ProtonMail
Ranking in Email Applications
10th
Average Rating
8.6
Reviews Sentiment
8.0
Number of Reviews
2
Ranking in other categories
No ranking in other categories
Zimbra Collaboration
Ranking in Email Applications
6th
Average Rating
8.0
Reviews Sentiment
7.3
Number of Reviews
28
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of February 2026, in the Email Applications category, the mindshare of ProtonMail is 7.5%, up from 3.9% compared to the previous year. The mindshare of Zimbra Collaboration is 6.9%, down from 9.1% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Applications Market Share Distribution
ProductMarket Share (%)
Zimbra Collaboration6.9%
ProtonMail7.5%
Other85.6%
Email Applications
 

Featured Reviews

AP
Media Content Creator Intern
Trust and anonymity play a key role in secure communications
I am uncertain about the two-factor authentication feature. I have had integrations with other Proton services and have used Proton VPN once, though it has limited features. Simple Mail, which was acquired by ProtonMail, has been very useful for me. The pricing is moderate. I have not used any paid services from ProtonMail. It is not very costly, but I have not used any premium services. I am a customer of ProtonMail. I would rate ProtonMail an eight out of ten due to their transparency and the utility of their simple login feature. My job and company name should remain hidden.
Muhammad Talha Baig - PeerSpot reviewer
Business Analyst and Associate Project Manager at SAMI Pharmaceuticals
One of the premium features was customized rooms tailored to the collaboration needs
Zimbra's strength lies in its individuality, and it should focus on leveraging its unique features rather than trying to emulate competitors. My organization has certified Zimbra technicians, so we believe we can utilize Zimbra certification. However, I was recently informed by Zimbra that no such certification exists. I have recently completed the test kit, and after the training, I will gain access to tickets. Therefore, if any clients are experiencing issues, we have a certified technical team available to provide support 24/7. This is how we can cater to our client's needs. I recommend Zimbra to small-scale and enterprise customers. Anyone, even those with 5 users, can opt for Zimbra. Overall, I rate the solution a nine 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 auto encryption of attachments is valuable."
"What I appreciate most about ProtonMail is that they are trusted, which is why I choose them."
"The most valuable feature of Zimbra for our team's productivity is its efficiency in handling email communication."
"The logs, troubleshooting, and tracking we have found to be the most valuable features. We have any issues with lost messages the features are useful. It is very easy to track and log."
"The product is easy to set up."
"The web interface is powerful and easy to use."
"Zimbra Collaboration is light to manage. It works on the Linux operating system, which is far better to manage than Microsoft Windows. Microsoft Exchange works only on the Windows server. We prefer working on the Linux server for security reasons and ease of management. Zimbra Collaboration also has some integrated tools for security. It some modules to fight malware. These modules are not very powerful but are still doing a great job. Microsoft Exchange doesn't have a basic module. You have to purchase a security solution and add it to the solution. The cost of Zimbra Collaboration is one more reason for liking it. It is also very simple to migrate from Zimbra Collaboration to another email solution."
"The backup and storage management features of Zimbra Collaboration are valuable."
"Zimbra Collaboration's best feature is its compatibility with Microsoft's ActiveSync protocol, which allows users to use Outlook on Windows or MacOS."
"We can control all the data in my IT infrastructure."
 

Cons

"I think it is good but I feel that only tech-savvy people use ProtonMail. It is not that popular among other people."
"One improvement could be the integration between ProtonMail and Proton Pass, allowing sharing of specific secrets via email."
"The solution could improve by making it easier to use."
"There are some security issues."
"We have had an issue with security."
"The solution’s forums don't have much information or documentation on administration tasks."
"I can confidently say that Zimbra is good enough for 2,000 client users. But, at the same time, if my client needs more than that and we have two options—Zimbra or Microsoft—I'm going with Microsoft because many admins will speak to Microsoft's ability to handle that many."
"It does have a few bugs."
"Zimbra should provide a desktop client. Right now, we are using a web browser for accessing our emails. There should also be a desktop client."
"Some issues cause the solution not to function correctly or to cause downtime once a month."
 

Pricing and Cost Advice

Information not available
"There is an annual standard licensing fee to use Zimbra Collaboration and there is no other cost."
"Zimbra Collaboration offers a good price-to-feature ratio."
"When it comes to the licensing of Zimbra Collaboration, my license covers the servers and I find its terms to be much simpler than those of Microsoft Exchange."
"I use Zimbra Collaboration's community version. We may move to the enterprise version since prices are affordable."
"The price of the solution is low."
"If you choose the network edition, it is a little pricier. They have the open-source edition too which is only community supported."
"The solution is not expensive compared to other products."
"We pay yearly licenses for Zimbra Collaboration."
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Top Industries

By visitors reading reviews
Comms Service Provider
22%
Educational Organization
9%
Computer Software Company
6%
Government
5%
Computer Software Company
12%
Comms Service Provider
10%
Government
8%
Manufacturing Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business19
Midsize Enterprise3
Large Enterprise7
 

Questions from the Community

What is your experience regarding pricing and costs for ProtonMail?
The pricing is competitive, offering good value on the average plan. It’s approximately $100 for annual billing.
What needs improvement with ProtonMail?
In terms of what can be improved in ProtonMail, I think it is good but I feel that only tech-savvy people use ProtonMail. It is not that popular among other people. Therefore, we do not use it for ...
What is your primary use case for ProtonMail?
My use cases include using ProtonMail for Drive occasionally for storing files. After some time, I stopped using that feature. Primarily, I use it for sending emails when I want to maintain anonymi...
How does Zimbra Collaboration compare with Microsoft Exchange?
Zimbra is a free, open source collaborative software suite. The features I like best are the ease of integration and the email, calendar, and collaboration server with web interface. In addition, I...
What do you like most about Zimbra Collaboration?
The most valuable feature of Zimbra for our team's productivity is its efficiency in handling email communication.
 

Overview

 

Sample Customers

Wall street journal,The New york times, The Gurdian, Forbes, Fox News
NEC Biglobe, City of Ventura, Monterey Bay Aquarium Research Institute, Hola Publishing, BIG, Sleepwell, LaFayette College, Xmission, DNA, Ring Line, Future Group, TIGC
Find out what your peers are saying about ProtonMail vs. Zimbra Collaboration and other solutions. Updated: February 2026.
881,733 professionals have used our research since 2012.