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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
6.8
Reviews Sentiment
7.3
Number of Reviews
10
Ranking in other categories
Email Archiving (8th)
Microsoft Exchange Online
Ranking in Email Applications
2nd
Average Rating
8.6
Reviews Sentiment
7.4
Number of Reviews
90
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of June 2025, in the Email Applications category, the mindshare of KerioConnect is 4.8%, up from 3.9% compared to the previous year. The mindshare of Microsoft Exchange Online is 13.8%, down from 15.7% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Applications
 

Featured Reviews

David Bloomer - PeerSpot reviewer
Lightweight, simple, and robust; easy to maintain and doesn't require a lot of system resources to run
Kerio Connect does as advertised, so there are no real issues with the product itself. It's developed regularly, so there are constant updates. Possibly, the support and development have lessened since they've sold the company, but as far as the product itself is concerned, there isn't anything that I would suggest needs improvement. If I'm being picky, Kerio Connect uses a proprietary, mappy atom for Outlook, and it would be nice if they used a native mappy connection instead, but that's the only additional feature that I would like to see in its next release. If they have native Outlook map integration, that would be great, but other than that, it's got all the functions that I think a mail server should have.
NancyHartman - PeerSpot reviewer
Effective collaboration achieved with versatile features and good customer service
There are always improvements needed. My personal issue with using OfficeSuite and the Exchange Server is that one has to cobble together a whole bunch of different applications. Therefore, a lot of scripting and programming knowledge is necessary. I am not an IT person; I am an educator, a trainer, a user. I want to get the work done. However, I find that the Exchange Server and possibly the way our company has set up access permissions require extensive programming knowledge. It might take six to eight weeks to get a programmer's time to build something, whereas I can use something like Smartsheet that will do everything I want without needing a programmer. Smartsheet is more end-user friendly compared to a Microsoft product. Microsoft believes an expert IT person should manage everything, however, I want to manage things on my own in a simplified way. That is not easy using the Exchange Server or Microsoft Office. It is not end-user friendly for development, and a programmer is needed. Once set up, using them as an end-user is fine. I find that the automations are not robust, and the FedRAMP systems are not robust. I have a few issues with Exchange and Office, but there's nothing I can do about it.

Quotes from Members

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

Pros

"What I like most about Kerio Connect is that it supports ActiveSync, and that is its most critical feature. The solution is also a nice, simple, robust, and stable mail server."
"The user interface is good."
"The most valuable features are its ease of use, excellent pricing, and it is platform agnostic."
"We use the solution as a mail server. It connects with Outlook and is used for calendaring and similar tasks."
"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."
"We have contacted technical support a handful of times and received some assistance."
"It's relatively simple to use."
"Its most valuable feature is the unlimited storage. It also has very little downtime."
"The product was simple to use."
"Microsoft Exchange Online has great functionality."
"The most valuable feature is the cloud environment."
"The most valuable feature of the solution is its integration with Microsoft Outlook and Microsoft Teams for shared calendars."
"I would rate Exchange Online's stability nine out of ten."
"The initial setup is straightforward and easy to configure."
"Microsoft Exchange Online's resiliency is its most valuable feature."
 

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."
"The search and archiving documentation capabilities need to be stronger."
"I would like to see better support from their support team."
"You cannot integrate with other services like Google Docs, Google Assistant, Google Calendar, etc."
"KerioConnect is stable as long as you use a strong password."
"Having a native Outlook map integration would make Kerio Connect better."
"The solution could improve the redundancy because we only have one copy of the Kerio Connect server on our hardware. The next step for us is to move to the cloud and if Kerio does not have a cloud version available they should release one"
"KerioConnect continues to improve with regular updates throughout the year. They must be added to the roadmap, which requires approval."
"Also, I think the mobile app on the forms you can improve a little bit more."
"From an IT perspective, we need clearer documentation to understand the product’s configuration process."
"There is room for improvement in terms of optimization."
"The solution is expensive."
"The pricing could be a bit lower."
"The SaaS platform performance could be improved. At a previous company, we used this same solution on-premises. The data exchange was much faster compared to the SaaS platform and we sometimes experience lags."
"The solution should have a stand-alone application instead of us having to go through an internet browser."
"My personal issue with using OfficeSuite and the Exchange Server is that one has to cobble together a whole bunch of different applications. Therefore, a lot of scripting and programming knowledge is necessary."
 

Pricing and Cost Advice

"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."
"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 product is expensive and has an annual subscription."
"Microsoft Exchange Online is an affordable solution."
"The price of Microsoft Exchange Online security could improve. The overall price of the solution is reasonable."
"We have a license per user scenario."
"There is an annual enterprise subscription to use Microsoft Exchange Online. The price is reasonable."
"It is a reasonable solution."
"The price is a bit high. It is especially expensive in the Indian market."
"I think that the price is a little high, especially considering that Google have a similar, free email solution."
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Top Industries

By visitors reading reviews
Computer Software Company
16%
Comms Service Provider
13%
Government
7%
Retailer
6%
Computer Software Company
13%
Financial Services Firm
9%
Comms Service Provider
7%
Educational Organization
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

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?
KerioConnect has a first-time cost and yearly subscription. It is not expensive.
What needs improvement with KerioConnect?
KerioConnect continues to improve with regular updates throughout the year. They must be added to the roadmap, which requires approval. In larger organizations, the server's capabilities and the da...
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?
The cost of Microsoft Exchange Online varies between $4 and $25 per user per month, depending on the different plans we use for different users.
What needs improvement with Microsoft Exchange Online?
The mobile version of Microsoft Outlook has limited features compared to the desktop version. We find fewer features in the mobile version of Microsoft Exchange Online, so that could be improved if...
 

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: June 2025.
856,873 professionals have used our research since 2012.