KerioConnect vs Microsoft Exchange Online comparison

GFI and Microsoft are both solutions in the Email Applications category. GFI is ranked #9 with an average rating of 8.7, while Microsoft is ranked #3 with an average rating of 8.8. GFI holds a 4.0% mindshare in EA, compared to Microsoft’s 9.3% mindshare. Additionally, 62% of GFI users are willing to recommend the solution, compared to 96% of Microsoft users who would recommend it.

KerioConnect

Read 11 KerioConnect reviews

1,960 Views
1,666 Comparison Views

62% willing to recommend

Microsoft Exchange Online

Read 92 Microsoft Exchange Online reviews

4,904 Views
4,708 Comparison Views

96% willing to recommend

KerioConnect

Microsoft Exchange Online

Comparison Buyer's Guide

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Executive SummaryUpdated on May 21, 2025

Microsoft Exchange Online and KerioConnect are two email and collaboration solutions. Microsoft Exchange Online seems to have the upper hand due to its extensive features and seamless integration with the Microsoft ecosystem, despite its higher cost, while KerioConnect is recognized for offering a more budget-friendly alternative with ease of use and simplicity.

Features: Microsoft Exchange Online is known for its seamless integration with Office 365, robust security features, and vast storage options which enhance enterprise value. KerioConnect is valued for its ActiveSync support, user-friendly setup, and flexibility in on-premise deployment, though it lacks some advanced integration capabilities.

Room for Improvement: Microsoft Exchange Online could improve by simplifying its licensing process, enhancing anti-spam features, and decreasing support response times. KerioConnect would benefit from more comprehensive documentation, better integration with CRM systems, and improved search and archiving capabilities.

Ease of Deployment and Customer Service: Microsoft Exchange Online, primarily deployed on public and hybrid clouds, offers scalability but can be complex to manage. KerioConnect supports on-premise deployment, providing greater control but less flexibility. Both solutions receive positive feedback for customer service.

Pricing and ROI: Microsoft Exchange Online offers multiple subscription models that, while confusing, provide flexibility, resulting in substantial ROI and comprehensive functionality for businesses. KerioConnect's pricing is considered more straightforward and affordable, presenting a strong value for smaller businesses and on-premise solutions.

To learn more, read our detailed KerioConnect vs. Microsoft Exchange Online Report (Updated: April 2026).

Buyer's Guide

KerioConnect vs. Microsoft Exchange Online

April 2026

Download the complete report

Helped 893,438 peers since 2012

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

Ranking in other categories

Email Archiving (7th)

Microsoft Exchange Online

Ranking in Email Applications

3rd

Average Rating

8.6

Reviews Sentiment

7.2

Number of Reviews

Ranking in other categories

No ranking in other categories

Mindshare comparison

As of May 2026, in the Email Applications category, the mindshare of KerioConnect is 4.0%, down from 4.7% compared to the previous year. The mindshare of Microsoft Exchange Online is 9.3%, down from 14.1% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Email Applications Mindshare Distribution
Product	Mindshare (%)
Microsoft Exchange Online	9.3%
KerioConnect	4.0%
Other	86.7%

Email Applications

Featured Reviews

Marcelino Mongcal

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.

Read full review

Asad Mohammad

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.

Read full review

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 its ease of use, excellent pricing, and it is platform agnostic."

"Kerio Connect is secure, flexible, and easy to control from the user interface."

"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."

"As long as the operating is stable, the Kerio connect will be very stable as well, so we don't have any problem with it."

"The most valuable features are security and privacy because you installed it on your server, within your company premises, not in the cloud."

"Backing up and maintaining it is straightforward compared to Microsoft Exchange, making it administrator-friendly."

"We use the solution as a mail server. It connects with Outlook and is used for calendaring and similar tasks."

"It's relatively simple to use."

More KerioConnect pros

"Intuitive in how to use."

"I have not had issues with stability of the product."

"When you used to write to someone, you would often begin typing their name and their email address would appear; you would simply click and you would have the correct email address. That has been working for a while, but having the location address appear was a pleasant surprise. It was amazing."

"It is pretty good, and user friendly."

"The features and flexibility in Microsoft Exchange Online cannot be found in any other email solutions—everything we need is there, and we do not have any complaints about it."

"I have not had issues with the stability of the product."

"The online version is faster, as it is a cloud instance. We can have massive mailbox capacity: 100 GB per user, which is huge. We can't provision such capacity internally, as the company would get burnt out paying for mailbox storage."

"The overall usage was all good."

More Microsoft Exchange Online pros

Cons

"KerioConnect is stable as long as you use a strong password."

"KerioConnect continues to improve with regular updates throughout the year. They must be added to the roadmap, which requires approval."

"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."

"Most of our clients use Outlook and Kerio Connect. Occasionally, Kerio can be a bit slow."

"The search and archiving documentation capabilities need to be stronger."

"It could be simpler to use and install, but I still wouldn't use it because there isn't a compelling use case."

"I don't particularly like this solution. I would not recommend this solution to others."

"Most of our clients use Outlook and Kerio Connect. Occasionally, Kerio can be a bit slow."

More KerioConnect cons

"The price could be cheaper."

"Improving the methods for inputting email signatures could be beneficial for the product."

"The solution's performance can be improved when you are trying to access it remotely."

"There are a lot of issues with security."

"The demo version we were provided had issues with emails bouncing or being delayed."

"In the past, we had issues with DB in mailboxes."

"When you migrate from on-prem to cloud, if you choose to or are forced to do the hybrid, they need to devise a way to undo the hybrid."

"The product needs to embed AI for intelligent searches and analytics."

More Microsoft Exchange Online cons

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."

"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 pricing is about $3 per mailbox per month."

"Initially, we had issues with the licensing agreement, but we worked it out with Microsoft."

"This solution requires a license."

"We have yearly licensing costs."

"Microsoft Exchange Online is too expensive."

"I find it reasonably priced."

"It is a reasonable solution."

"The price of the license depends on a lot of factors, such as the number of licenses and company specifics."

"We bought some licenses, and some are within our package or partnership with Microsoft."

More Microsoft Exchange Online pricing and cost advice

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Top Industries

By visitors reading reviews

Comms Service Provider

14%

Manufacturing Company

Computer Software Company

Performing Arts

Financial Services Firm

Comms Service Provider

Manufacturing Company

Computer Software Company

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

By reviewers
Company Size	Count
Small Business	10
Midsize Enterprise	2

By reviewers
Company Size	Count
Small Business	40
Midsize Enterprise	16
Large Enterprise	41

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.

See all answers

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.

See all answers

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 ...

See all answers

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.

See all answers

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 ...

See all answers

What is your primary use case for Microsoft Exchange Online?

I currently work with a Microsoft partner and I support users that use Microsoft Exchange Online. I also use Microsoft Exchange Online myself. I use the shared calendar feature of Microsoft Exchang...

See all answers

Comparisons

Microsoft Exchange vs KerioConnect

Compared 25% of the time

Zimbra Collaboration vs KerioConnect

Compared 14% of the time

IceWarp vs KerioConnect

Compared 11% of the time

Open-Xchange vs KerioConnect

Compared 9% of the time

Google Workspace vs KerioConnect

Compared 6% of the time

More KerioConnect Competitors

Google Workspace vs Microsoft Exchange Online

Compared 25% of the time

Open-Xchange vs Microsoft Exchange Online

Compared 14% of the time

Amazon WorkMail vs Microsoft Exchange Online

Compared 10% of the time

Zimbra Collaboration vs Microsoft Exchange Online

Compared 8% of the time

MBOX to PST Converter vs Microsoft Exchange Online

Compared 2% of the time

More Microsoft Exchange Online Competitors

Product Reports

Buyer's Guide

KerioConnect

May 2026

Download KerioConnect product report

Buyer's Guide

Microsoft Exchange Online

April 2026

Download Microsoft Exchange Online product report

Also Known As

No data available

Exchange Online, Exchange Online Plan 1, Exchange Online Plan 2, MS Exchange Online

Overview

KerioConnect delivers easy-to-use and secure email, calendar, and collaboration tools compatible with Office, Apple, and ActiveSync. Cost-effective and flexible, it suits on-premise installations, especially for SMBs seeking privacy and security.

KerioConnect offers a comprehensive email server experience with minimal resource needs and effective spam filtering. Compatible across platforms, it supports Outlook, enabling organizations to manage corporate communications efficiently. Its ability to host multiple domains makes it suitable for sectors like warehouse distribution and retail, with installation options that enhance security and privacy. However, faster Outlook integration, improved MS Teams and CRM system integration, and AI functionalities are sought after by users. Some demand a cloud version, Linux support, and better documentation. Still, KerioConnect remains a reliable choice for those needing on-premise capabilities.

What are KerioConnect's Key Features?

Ease of Use: Simplified interface for seamless navigation.
Robust Security: Advanced protection measures to safeguard data.
Spam Filtering: Efficiently reduces unwanted emails.
Platform Compatibility: Integrates with Office, Apple, and ActiveSync.
Log Analysis: Offers detailed insights for server management.
Multiple Domain Support: Manages diverse domains with ease.

What Benefits Should Users Expect?

Cost Efficiency: Lowers operational costs compared to alternatives.
Resource Minimization: Requires minimal system resources.
Deployment Flexibility: Allows tailored on-premise installations.
Enhanced Security: Provides privacy through internal hosting options.
Reliable Support: Access to reseller services from Sophos.

KerioConnect is widely utilized in SMBs across sectors like retail and warehouse distribution for its capability to handle multiple domains and integrate with Outlook for communication management. Resellers offer it as a dependable on-site email management solution, letting businesses maintain oversight and security control.

GFI

Microsoft Exchange Online offers seamless cloud-based access with extensive scalability, unlimited storage, and integrated tools like Outlook and Teams. It facilitates collaboration with strong security, making it a reliable and cost-effective choice for businesses.

Microsoft Exchange Online is a robust email hosting service that supports cloud integration for enhanced communication and document management. Known for its reliable performance, it minimizes downtime and ensures security with its anti-spam and malware protection. The platform provides scalability to accommodate growing communication needs, offering centralized global usability and document automation. However, challenges include managing complexity and integration, as well as addressing slow updates and storage limitations. Its user interface could improve to better support extensive customization and simplified administration. Though technical support and automation features need bolstering, Exchange Online remains a trusted solution for diverse industries, facilitating remote work with flexible configurations.

What features define Microsoft Exchange Online?

Cloud-Based Access: Enables seamless access to emails and documents
Unlimited Storage: Offers vast storage capabilities for email management
Integrated Tools: Works with Microsoft tools like Outlook and Teams
Strong Security: Provides anti-spam and malware protection
Scalability: Supports growing communication needs
Centralized Usability: Ensures consistent global access

What benefits should users consider in reviews?

Enhanced Collaboration: Facilitates teamwork with integrated tools
Cost-Effectiveness: Offers reliable service at competitive pricing
Reliable Performance: Delivers consistent access with minimal downtime
Security: Maintains robust security features for data protection
Flexibility: Accommodates hybrid and remote work settings

Microsoft Exchange Online is widely used across industries for email hosting, calendaring, and messaging solutions. Businesses exploit its cloud integration to manage large email volumes and schedule meetings efficiently. The platform's scalability offers flexible configurations, supporting hybrid environments and remote work needs.

Microsoft

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

Buyer's Guide

KerioConnect vs. Microsoft Exchange Online

April 2026

Free Report: KerioConnect vs. Microsoft Exchange Online

Find out what your peers are saying about KerioConnect vs. Microsoft Exchange Online and other solutions. Updated: April 2026.

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