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 8.8, while Microsoft is ranked #2 with an average rating of 8.7. GFI holds a 3.9% 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

1,821 Views
1,566 Comparison Views

62% willing to recommend

Microsoft Exchange Online

Read 92 Microsoft Exchange Online reviews

4,615 Views
4,430 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

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Helped 890,088 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 April 2026, in the Email Applications category, the mindshare of KerioConnect is 3.9%, down from 4.8% compared to the previous year. The mindshare of Microsoft Exchange Online is 9.8%, 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	9.8%
KerioConnect	3.9%
Other	86.3%

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

"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 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."

"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."

"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."

"It's relatively simple to use."

"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."

More KerioConnect pros

"It has helped us because we don't have to worry about servers crashing."

"I like that Exchange Online is easy to use and that I do not need to maintain the previous Exchange Server."

"Intuitive and easy to use."

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

"Microsoft Exchange Online is easy to use. You have a common storage where people can store documents. It also helps with version control."

"The most valuable feature is the cloud environment."

"The initial setup is pretty much straightforward."

"From the security point of view, you can specify the IP range from the area your system should be connected, and you can have the authentication based on the user certificates of your Active Directory, which improves the security, as well, and there is a flawless integration."

More Microsoft Exchange Online pros

Cons

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

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

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

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

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

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

"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."

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

More KerioConnect cons

"I would prefer an anti-malware functionality in at least the basic version."

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

"In terms of areas for improvement, I think Microsoft could enhance security. Right now, there are limited options for security within Exchange Online, and much of it relies on third-party security and compliance tools. I'd like to see more security features directly integrated. One specific area that needs improvement is the configuration of SMTP for third-party applications. It's challenging to manage without an on-premise SMTP server, and this is an issue many organizations face, including ours. If Microsoft could offer better SMTP configuration for third-party applications within Exchange Online, it would greatly benefit us."

"I don't like it in general. It sort of has that Microsoft flavor to it, which is just the style they use and the way they color things and lay them out."

"They should tighten their cloud security."

"The mail-blocking feature is not great and could be improved."

"The solution should have a stand-alone application instead of us having to go through an internet browser."

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."

"We pay per user per year for the cluster with over a thousand users."

"In my opinion, the online license is the best one we have. It is a bundle that we have from Microsoft. It is a bit high in price."

"The cost of Microsoft Exchange Online is approximately $4 to $36 per user. They do not give a discount which is not good. The solution is expensive if you have 800 to 1,000 users. They should give discounts when you have a lot of users."

"Microsoft Exchange Online is too expensive."

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

"It is a cluster solution."

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

"We have an enterprise agreement for licensing."

More Microsoft Exchange Online pricing and cost advice

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Top Industries

By visitors reading reviews

Comms Service Provider

13%

Manufacturing Company

Computer Software Company

Performing Arts

Financial Services Firm

Manufacturing Company

Computer Software Company

Comms Service Provider

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	40

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 27% of the time

Zimbra Collaboration vs KerioConnect

Compared 15% of the time

IceWarp vs KerioConnect

Compared 11% of the time

Open-Xchange vs KerioConnect

Compared 8% of the time

Google Workspace vs KerioConnect

Compared 5% of the time

More KerioConnect Competitors

Google Workspace vs Microsoft Exchange Online

Compared 24% of the time

Open-Xchange vs Microsoft Exchange Online

Compared 15% 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 1% of the time

More Microsoft Exchange Online Competitors

Product Reports

Buyer's Guide

KerioConnect

April 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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