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 896,467 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."

"We have contacted technical support a handful of times and received some assistance."

"The user interface is good."

"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."

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

"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."

"This solution is our SMB alternative to Exchange, installed for more than forty SMB customers in a Linux environment with all of the collaboration features."

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

More KerioConnect pros

"Exchange Online plays a significant role in our business; it controls all our emails, so we'd be in a lot of trouble if we didn't have that, and it's an essential product."

"Having the solution on the cloud has alleviated the need to have hardware on-premises, so I no longer have to deal with the expense of power usage and the hardware taking up space, and we can now focus more on the business instead of our assets."

"The best part of this solution is the security it offers, where we are able to determine which mailboxes have been blocked or which mailboxes cannot be allowed to send traffic because of a violation."

"It is pretty good, and user friendly."

"Technical support is helpful."

"The uptime and stability is far better than any on-prem or hosted solution I have used in the past."

"All of the Microsoft Exchange Online is very useful, such as the sections, the information protection, and the mail flows."

"Microsoft Exchange Online has great functionality."

More Microsoft Exchange Online pros

Cons

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

"You cannot integrate with other services like Google Docs, Google Assistant, Google Calendar, etc."

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

"The solution could improve the redundancy because we only have one copy of the Kerio Connect server on our hardware."

"I would like to see better support from their support team."

"We cannot compete with them because they're fully integrated with their applications."

"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."

More KerioConnect cons

"In the next release, I would like to see more features added to the security of the solution."

"The pricing could be cheaper."

"The problem with Exchange is that the attributes aren't flexible enough. I'd like to see more interaction with Office 365 and tighter integration between on-prem Exchange and Exchange Online. There's still a disconnect between mailboxes and the cloud."

"The licensing price of the solution could be lower."

"This product is too complex to use."

"The solution must provide better security features."

"We'd like to have the ability to recall emails on the web. I'm not sure if that is available yet."

"We'd like to see more integration with other platforms."

More Microsoft Exchange Online cons

Pricing and Cost Advice

"The price of Kerio Connect is better when comparing it to others solutions."

"KerioConnect has a first-time cost and yearly subscription. It is not expensive."

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

"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."

"I would give the cost a five out of ten."

"The licensing cost increased at least 15 to 20 percent recently and it would be helpful for them to be reduced."

"The price is not competitive."

"I am using Office 365 and Microsoft Exchange Online comes as the package. It cost approximately $13 per month."

"The licensing price is ok, I'd rate it as four out of five."

"The model is one which is pay-per-use go. There is no license. We are talking about per-user subscription-based use."

"The price of the solution could be less expensive."

"Microsoft Exchange Online is too expensive."

More Microsoft Exchange Online pricing and cost advice

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Top Industries

By visitors reading reviews

Comms Service Provider

15%

Manufacturing Company

Computer Software Company

Retailer

Comms Service Provider

Financial Services Firm

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	42

Questions from the Community

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 ...

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What is your primary use case for KerioConnect?

Small medium-sized businesses are our primary focus, particularly in warehouse distribution and retail sectors. We are a reseller and purchase directly from Sophos.

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 23% of the time

Zimbra Collaboration vs KerioConnect

Compared 13% of the time

IceWarp vs KerioConnect

Compared 10% of the time

Open-Xchange vs KerioConnect

Compared 9% of the time

ProtonMail vs KerioConnect

Compared 7% of the time

More KerioConnect Competitors

Google Workspace vs Microsoft Exchange Online

Compared 28% of the time

Open-Xchange vs Microsoft Exchange Online

Compared 13% 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

HCL Domino vs Microsoft Exchange Online

Compared 3% 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

May 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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