I use Kerio Connect for email applications.
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. I also like that it doesn't require a lot of system resources to run because it's all integrated into itself, and it doesn't rely on any other technologies to function. We went from Exchange to Kerio Connect for those reasons.
Kerio Connect does as advertised, so there are no real issues with the product itself. It's developed regularly, so there are constant updates. Possibly, the support and development have lessened since they've sold the company, but as far as the product itself is concerned, there isn't anything that I would suggest needs improvement. If I'm being picky, Kerio Connect uses a proprietary, mappy atom for Outlook, and it would be nice if they used a native mappy connection instead, but that's the only additional feature that I would like to see in its next release. If they have native Outlook map integration, that would be great, but other than that, it's got all the functions that I think a mail server should have.
I've been working with Kerio Connect for ten years.
Kerio Connect is a stable solution.
Kerio Connect is a scalable solution. How easy it is to scale would depend on the degree you want it to scale. For our clientele, it's perfectly fine. If you have up to fifty users, it's fine. I haven't tried to scale it beyond that. I can't see any reason why it wouldn't accept more. I/O is the critical resource that it requires beyond that, so as long as you have fast drives, there's no reason why you couldn't go bigger in terms of scaling Kerio Connect. It supports a lot of features and clustering, and if we have a lot of users, it's fine.
We've worked with several solutions over the years, and we went with Kerio Connect because we weren't happy with Microsoft Exchange or Microsoft 365 at the time. We got more back from Microsoft Exchange, particularly in a host environment, but we found the on-premises version way too unwieldy for the number of clients, or the size of clients that we deal with. For example, the server and all the other infrastructure to make it function was way too complex and expensive, while Kerio Connect is simple and lightweight, and it does what you need.
Kerio Connect is also much easier to maintain and keep going, compared to Microsoft Exchange which was unwieldy. You have to update Microsoft Exchange, plus it has all these prerequisite requirements. We also tried SmarterMail, but we're stuck with Kerio Connect because it works.
The initial setup for Kerio Connect was very straightforward.
I evaluated Microsoft Exchange.
I use both Kerio Control and Kerio Connect.
Kerio Connect is deployed on-premises. It has a cloud version, but we use its on-premises version.
I'm giving Kerio Connect a high score, but it would depend on simple use cases and the number of clients you're using it for. For what we've used it for, it's a nine out of ten because it works.
