KerioConnect vs Microsoft Exchange Online comparison

Why PeerSpot?

GFI and Microsoft are both solutions in the Email Applications category. GFI is ranked #8 with an average rating of 10.0, while Microsoft is ranked #2 with an average rating of 8.8. GFI holds a 3.5% mindshare in EA, compared to Microsoft’s 9.8% 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

2,457 Views
1,818 Comparison Views

62% willing to recommend

Microsoft Exchange Online

Read 93 Microsoft Exchange Online reviews

6,892 Views
6,685 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: November 2026).

Buyer's Guide

KerioConnect vs. Microsoft Exchange Online

November 2026

Download the complete report

Helped 921,714 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

8th

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 November 2026, in the Email Applications category, the mindshare of KerioConnect is 3.5%, down from 4.3% compared to the previous year. The mindshare of Microsoft Exchange Online is 9.8%, down from 12.0% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Email Applications Mindshare Distribution
Product	Mindshare (%)
Microsoft Exchange Online	9.8%
KerioConnect	3.5%
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

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

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

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

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

"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."

"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 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."

"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."

More KerioConnect pros

"The best part of this solution is the security it offers."

"The solution is quite convenient because you can access the web version anywhere."

"Message trace is the most valuable feature of the product."

"The initial setup is straightforward and easy to configure."

"The solution generally works well. We can send and receive emails just fine."

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

"The reliability factor is high."

More Microsoft Exchange Online pros

Cons

"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"

"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."

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

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

"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."

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

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

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

More KerioConnect cons

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

"The pricing could be cheaper."

"There is an annual enterprise subscription could improve by having more features."

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

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

"Microsoft does not provide an automated way to migrate Public Folders."

"I have found that Microsoft has vulnerabilities when it comes to Exchange Online. It has become the port of a lot of hacker attacks."

"The support from the vendor is fine. However, it could be faster, and some of the agents could be more knowledgeable, but it is a large solution, there's a lot of information that the agents have to work with. I can't always expect when I get connected to the first-level agent that they will know absolutely everything. Sometimes there's no replacement for pure experience."

More Microsoft Exchange Online cons

Pricing and Cost Advice

"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."

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

"I think that the price is a little high, especially considering that Google have a similar, free email solution."

"We pay a yearly licensing fee for the solution."

"The solution's pricing is reasonable."

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

"The pricing is really high. It's higher compared to other services."

"Microsoft solutions are expensive."

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

"I pay approximately $120 or $150 per year, and as long as I pay that amount, they will do regular updates so that I always have the most recent and greatest version of the application."

More Microsoft Exchange Online pricing and cost advice

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Top Industries

By visitors reading reviews

Manufacturing Company

12%

Comms Service Provider

12%

Outsourcing Company

10%

Construction Company

Manufacturing Company

11%

Outsourcing Company

Comms Service Provider

Financial Services Firm

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.

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 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 12% 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 9% of the time

ProtonMail vs KerioConnect

Compared 6% of the time

More KerioConnect Competitors

Google Workspace vs Microsoft Exchange Online

Compared 44% of the time

Amazon WorkMail vs Microsoft Exchange Online

Compared 7% of the time

Open-Xchange vs Microsoft Exchange Online

Compared 6% of the time

IceWarp vs Microsoft Exchange Online

Compared 6% of the time

HCL Verse vs Microsoft Exchange Online

Compared 2% of the time

More Microsoft Exchange Online Competitors

Product Reports

Buyer's Guide

KerioConnect

October 2026

Download KerioConnect product report

Buyer's Guide

Microsoft Exchange Online

October 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

November 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: November 2026.

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