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KerioConnect vs Microsoft Exchange Online comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on May 21, 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

KerioConnect
Ranking in Email Applications
9th
Average Rating
7.2
Reviews Sentiment
7.3
Number of Reviews
11
Ranking in other categories
Email Archiving (7th)
Microsoft Exchange Online
Ranking in Email Applications
2nd
Average Rating
8.6
Reviews Sentiment
7.2
Number of Reviews
92
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of February 2026, in the Email Applications category, the mindshare of KerioConnect is 4.0%, down from 4.9% compared to the previous year. The mindshare of Microsoft Exchange Online is 11.1%, down from 14.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Applications Market Share Distribution
ProductMarket Share (%)
Microsoft Exchange Online11.1%
KerioConnect4.0%
Other84.9%
Email Applications
 

Featured Reviews

MM
Senior Systems Tech/Admin at Samco Software Inc.
A seamless setup ensures smooth communication with comprehensive support
We remain a partner with Sophos and use XG S Firewalls without AWS implementation. We only use Sophos endpoint and Sophos Central. We host some clients on-premise while others we host remotely. The VPN connection is easy and proprietary, so it's not open to any other VPN clients. Communication with other mail servers is seamless. It can communicate with Gmail and Outlook without issues, provided the DNS settings are correct. We monitor our servers and security logs, implementing GeoIP blocking. We frequently block China and India IPs due to brute force attacks on our servers. We have extensive experience with KerioConnect. Backing up and maintaining it is straightforward compared to Microsoft Exchange, making it administrator-friendly. On a scale of 1-10, this solution rates an 8.
AM
Assistant General Manager, IT Infrastructure at SAMI Pharmaceuticals (Pvt.) Limited.
Offers flexibility and cost-effectiveness with multiple service options but could improve support and mobile features
There are many things to consider about email management in Microsoft Exchange Online. The online management is good, the storage is sufficient, and we use most of the features such as the custom rules in Microsoft Exchange Online, which we cannot find in any other email solution. That is a very good option, as we have many options to create custom rules in Microsoft Exchange Online. Regarding security features in Microsoft Exchange Online, we also use Defender for Exchange which includes the basic Exchange Online protection that has spam and threat controls. The use of Defender is beneficial for our security. The flexibility of choosing plans in Microsoft Exchange Online is good. We have chosen the best plan for our use, including multiple licenses such as plan one and business basics, which leads us towards cost-effectiveness, and the pay-as-you-go option is more flexible. Microsoft Exchange Online is very scalable.

Quotes from Members

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

Pros

"The most valuable features are security and privacy because you installed it on your server, within your company premises, not in the cloud."
"The solution is easy to maintain, unlike Exchange. It's easy to create multiple domains and back up and restore if needed. It also has good security features like anti-spam and antivirus."
"Kerio Connect is secure, flexible, and easy to control from the user interface. It has many security features able to be controlled from one place, such as anti-spam. I have found it very convenient. Additionally, you can analyze log files and share folders which is helpful."
"Backing up and maintaining it is straightforward compared to Microsoft Exchange, making it administrator-friendly."
"The user interface is good."
"KerioConnect has integration with 365. We can use Outlook, which has its client and can be used with Apple devices. It integrates with the App Store and Microsoft Office. It has a smart router. The spam filtering and antivirus are good."
"The most valuable features are its ease of use, excellent pricing, and it is platform agnostic."
"It's relatively simple to use."
"Exchange Online is a straightforward cloud-based application. It's easy to connect and the interface is user friendly."
"Microsoft Exchange Online is a very stable solution."
"Exchange Online's most valuable features are two-step verification and security."
"Exchange Online's best feature is its webmail platform."
"This solution makes it very easy to receive and detect problems about the mail flow and offers very good reporting. In general, it's very easy to manage the organization's mailboxes."
"The most valuable feature of Microsoft Exchange Online is if you have people that are geographically distributed from each other is good. For example, if you have people in the United States, Europe, Africa, Asia, and Australia, having an online solution works best because then you can reach the scale of the data centers that are available by Microsoft. Additionally, if you're only going to have two to three people using the solution the cost is a lot less than having an onsite server and licensing. It is highly beneficial in these areas."
"Microsoft Exchange Online is easy to use. You have a common storage where people can store documents. It also helps with version control."
"It is a fantastic solution."
 

Cons

"We are considering switching to Microsoft Exchange. One reason is that it doesn't improve our workflow and doesn't integrate well with Microsoft 365 applications."
"You cannot integrate with other services like Google Docs, Google Assistant, Google Calendar, etc."
"I would like to see better support from their support team."
"Most of our clients use Outlook and Kerio Connect. Occasionally, Kerio can be a bit slow. They could make it faster to get onto the web interface without so much load time. It's just slow with Outlook, however, for some reason."
"The search and archiving documentation capabilities need to be stronger."
"KerioConnect is stable as long as you use a strong password."
"We cannot compete with them because they're fully integrated with their applications."
"Having a native Outlook map integration would make Kerio Connect better."
"The stability of the solution on Mac products has room for improvement."
"I think there should be an incorporation of DLP on the business premium version of Exchange, as well."
"I would like to make the solution more user-friendly."
"The solution must provide better security features."
"For non-technical people, some configurations might be a little bit difficult. We can use it on our laptops or our portable devices like mobiles and others gadgets, but we have had repeated problems with syncing. That is, when using different gadgets and devices, there are issues with syncing. The configuration could definitely be improved."
"In the next release, I would like to see more features added to the security of the solution."
"I couldn't delete an email account because it was identified as my primary account by the application."
"Microsoft Exchange Online could improve the overall protection of the solution."
 

Pricing and Cost Advice

"KerioConnect has a first-time cost and yearly subscription. It is not expensive."
"The price of Kerio Connect is better when comparing it to others solutions."
"The solution's pricing depends on how long you plan to keep it because you pay on a per-year basis. You might have a one-time setup cost for something like Microsoft Exchange or a Linux mail server. I'd say this solution is expensive on a per-year basis, almost 2000-3000 dollars annually. It doesn't seem to pay off yet, so we're considering switching to another product."
"The pricing is about $3 per mailbox per month."
"Microsoft Exchange Online is an affordable solution."
"I have no opinion."
"We pay a yearly licensing fee for the solution."
"It is a reasonable solution."
"We have a license per user scenario."
"In my opinion, the online license is the best one we have. It is a bundle that we have from Microsoft. It is a bit high in price."
"The cost is around $12 to $16 per user."
"The price is a bit high. It is especially expensive in the Indian market."
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Top Industries

By visitors reading reviews
Comms Service Provider
13%
Computer Software Company
11%
Manufacturing Company
9%
Retailer
8%
Financial Services Firm
9%
Computer Software Company
9%
Educational Organization
7%
Manufacturing Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business10
Midsize Enterprise2
By reviewers
Company SizeCount
Small Business40
Midsize Enterprise16
Large Enterprise40
 

Questions from the Community

What do you like most about KerioConnect?
The most valuable features are security and privacy because you installed it on your server, within your company premises, not in the cloud.
What is your experience regarding pricing and costs for KerioConnect?
The pricing is very easy to understand. As a partner, we have a monitoring system that informs us when subscriptions expire, allowing us to handle renewals. The pricing is very competitive.
What needs improvement with KerioConnect?
Since KerioConnect is a setup and go solution, everything works on its own. The only administrative tasks required are keeping it up to date, monitoring security logs, and ensuring protection from ...
What do you like most about Microsoft Exchange Online?
The benefits are widespread and effective communication. We use Microsoft Teams for meetings within and outside our organization. Additionally, Teams can be used for chat, allowing us to track comm...
What is your experience regarding pricing and costs for Microsoft Exchange Online?
If I segment it into three points: low price, average, and high price, I would place Microsoft Exchange Online between average and high price.
What needs improvement with Microsoft Exchange Online?
There is room for improvement in Microsoft Exchange Online. Technical support for Microsoft is good, but in all fairness, I sometimes think more can be done. I have personally tried exploring with ...
 

Also Known As

No data available
Exchange Online, Exchange Online Plan 1, Exchange Online Plan 2, MS Exchange Online
 

Overview

 

Sample Customers

Southern Tier Brewing Company, Innotta, Baustoff + Metall, Hamifleurs, Chanson TV, Ryman Stationery
Bank Alfalah Ltd., Paderborn-Lippstadt Airport, Blue Star Infotech, Scitec Nutrition, Resolution Films, British Airways, Empire Cinemas, InnoGames
Find out what your peers are saying about KerioConnect vs. Microsoft Exchange Online and other solutions. Updated: February 2026.
882,961 professionals have used our research since 2012.