KerioConnect vs Microsoft Exchange Online comparison

Why PeerSpot?

GFI and Microsoft are both solutions in the Email Applications category. GFI is ranked #9 with an average rating of 10.0, while Microsoft is ranked #2 with an average rating of 8.7. GFI holds a 3.3% mindshare in EA, compared to Microsoft’s 9.7% 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

2,286 Views
1,760 Comparison Views

62% willing to recommend

Microsoft Exchange Online

Read 93 Microsoft Exchange Online reviews

6,227 Views
6,040 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: August 2026).

Buyer's Guide

KerioConnect vs. Microsoft Exchange Online

August 2026

Download the complete report

Helped 911,602 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

2nd

Average Rating

8.6

Reviews Sentiment

7.2

Number of Reviews

Ranking in other categories

No ranking in other categories

Mindshare comparison

As of September 2026, in the Email Applications category, the mindshare of KerioConnect is 3.3%, down from 4.4% compared to the previous year. The mindshare of Microsoft Exchange Online is 9.7%, down from 12.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Email Applications Mindshare Distribution
Product	Mindshare (%)
Microsoft Exchange Online	9.7%
KerioConnect	3.3%
Other	87.0%

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

Yogesh Autade

Senior Security Engineer at Softcell Technologies Limited

Integrated email security has improved phishing response and provides better threat visibility

Microsoft Exchange Online could be improved with more intuitive administration workflows, better troubleshooting visibility, and simpler mail flow analysis for complex environments. We would also appreciate more granular reporting, faster access to detailed message tracking data, and improved alerting around suspicious mailbox activity to help security and messaging teams investigate issues more efficiently. One area where Microsoft Exchange Online could improve is the administrative user experience. Some advanced mail flow, compliance, and troubleshooting tasks still require navigating multiple Microsoft portals. A more unified management interface and deeper integration visibility across Exchange, Defender, and Microsoft 365 security tools would make day-to-day operations more efficient for administrators and SOC teams.

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 user interface is good."

"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."

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

"It's relatively simple to use."

"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."

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

"The most valuable features are its ease of use, excellent pricing, and it is platform agnostic."

More KerioConnect pros

"I enjoy not having to maintain the local infrastructure, local servers, local whatever. You use the software and don't have to worry about the details."

"Microsoft Exchange Online is cloud-based and we always use the latest version."

"Exchange Online's performance and stability are very good."

"The stability has increased exponentially since 2010 and the reliability factor is high."

"It does what it's supposed to do with minimal issues, and the solution is very easy to set up and quite quick to deploy."

"Exchange Online is consistent."

"Microsoft Exchange Online is an easy-to-use solution."

"The tech support have always been very nice and helpful to us."

More Microsoft Exchange Online pros

Cons

"Having a native Outlook map integration would make Kerio Connect better."

"This is just a cost, it's not something that's driving our business forward; it's just foundational."

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

"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"

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

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

"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."

More KerioConnect cons

"The interface is a bit confusing."

"When initially setting up, it took a bit of time because we had a lot of PST files with the users, and we had to migrate them batch by batch."

"I would like to let new users know that there are challenges regarding user provisioning, HRMS and the AD. Also, the data migration integrity needs to be checked in terms of the old data."

"There is room for improvement in terms of optimization."

"I feel that there is a need for improvement in the product, considering that there are some concerns with the tool's integration capabilities."

"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."

"There is room for improvement in terms of security, as it could be better."

More Microsoft Exchange Online cons

Pricing and Cost Advice

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

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

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

"The pricing for Microsoft Exchange Online is quite reasonable, in my opinion. Many licensing options are available so that we can choose based on the customer's needs. For example, if a customer only requires mailbox features, we can recommend Plan One or Plan 2. We can suggest an E3 or E5 license if they need the entire Office suite. There are also premium subscriptions for enterprise customers, offering additional security features. Overall, I don't find the pricing costly because Microsoft provides many features and security capabilities, making it reliable for all customers, depending on their requirements."

"The pricing for this solution is good. We renew our contract every three years. I would rate the pricing for this solution a three out of five."

"They have raised their prices, and obviously, it hits our customers. Some of them are deciding to step back from Office 365. For customers who have bought the annual subscription, they are moving to the monthly subscription."

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

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

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

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

More Microsoft Exchange Online pricing and cost advice

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Top Industries

By visitors reading reviews

Comms Service Provider

13%

Manufacturing Company

11%

Construction Company

Outsourcing Company

Comms Service Provider

10%

Financial Services Firm

Manufacturing Company

Construction 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	41
Midsize Enterprise	17
Large Enterprise	41

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.

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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?

See all answers

What is your primary use case for Microsoft Exchange Online?

Microsoft Exchange Online serves as our enterprise email hosting platform, providing secure mail flow management and centralized messaging services for users across multiple locations. From a secur...

See all answers

Comparisons

Microsoft Exchange vs KerioConnect

Compared 14% of the time

Zimbra Collaboration vs KerioConnect

Compared 10% of the time

Open-Xchange vs KerioConnect

Compared 9% of the time

IceWarp vs KerioConnect

Compared 8% of the time

Proofpoint Intelligent Compliance Platform vs KerioConnect

Compared 7% of the time

More KerioConnect Competitors

Google Workspace vs Microsoft Exchange Online

Compared 40% of the time

Open-Xchange vs Microsoft Exchange Online

Compared 9% of the time

Amazon WorkMail vs Microsoft Exchange Online

Compared 8% of the time

IceWarp vs Microsoft Exchange Online

Compared 6% of the time

HCL Verse vs Microsoft Exchange Online

Compared 3% of the time

More Microsoft Exchange Online Competitors

Product Reports

Buyer's Guide

KerioConnect

August 2026

Download KerioConnect product report

Buyer's Guide

Microsoft Exchange Online

August 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

August 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: August 2026.

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