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Kerio Connect (was Kerio MailServer) is an Exchange alternative, allowing companies to collaborate via email, shared contacts, shared calendars, notes, and tasks.

Kerio MailServer comes with:

  • Groupware support for Outlook, Entourage, iCal, Apple Address Book, Web mail, and popular smartphones
  • Push email and wireless PIM synchronization with Palm, Windows Mobile, Symbian, and BlackBerry devices
  • Anti-spam protection
  • Anti-virus protection
  • Email archiving
  • Automated backup

What's New

Version 8.3.1 (2843):

Kerio Connect

  • Added support for certificates with multiple email addresses.
  • Added support for certificates where email(s) are defined in the subject alternative name field.
  • OpenSSL library upgraded to version 1.0.1h to fix a SSL/TLS man-in-the-middle vulnerability (CVE-2014-0224).
  • IM service failed to start if mail archive folder more...


OS X 10.6 or later

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Kerio Connect User Discussion

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mac adam Member IconComment+154
mac adam

The CalDav with Kerio Mail Server do not allow me create event in iCal on SnowLeopard…
I wait for a fix to switch, please update ;)
Nice Application.

Reply0 replies
Version 6.7.1
KMac99 Member IconComment+1

I've been using this product for years. I recommend it to all my clients. For most of my clients I recommend they get it hosted, because then they don't have to worry about it at all, just sign up and` go. We alwayS use www.keriomailhosting.com for the hosted version of Kerio, they have the best prices and their service has been wonderful.

Reply1 reply
Version 6.7 patch 1

But it's possible to use your own service provider, isn't it? Thanks!

DrFix Member IconReview+0

I'd searched high and low for an email server that wouldn't require me to be a full time administrator. Many, while free , took too much of my time away from other tasks in order to manage or study up on, and others were so expensive as to put them out of reach of mere mortals(ex: CGP).

KMS was, for me at least, approachable and easy enough to understand that it took little time to configure a working SMTP/POP/IMAP server with options. To get the full benefit did take some time to pour over the documentation because, to be quite frank, there are some areas that simply are not explained very well or at all.

That being said I've been more than impressed by its stability and only wish that Kerio had a more liberal upgrade policy because you either get locked into their "subscription" or pay nearly the full price over and over and over. For larger enterprises I can see the benefit but for now I'll stay with an albeit "older" version but one that works.

This is a good product and I look forward to where its headed.

Reply0 replies
Version 6.3.1
swgs1 Member IconComment+3

This is a replacement for Exchange, it is much more than just a mail server. Email, Contacts, Calendars, and Tasks, available anywhere with internet access. All for much cheaper than Microsoft Exchange.

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Version 6.3
Anonymous Member IconReview

I have been using kerio mailserver for about 3 months now, and have been very happy with the results. The user interface is very simple, and the webmail is the first i've seen that really rivals exchange's webmail. For the price, features, and ease of use, this program is right on. The spam filter has been very good, the outlook integration is almost seamless, and the simplicity of the admin interface makes it simple to implement on any platform. Kerio's support team has been wonderful so far, walking me through any issues i had, from setup to bugfixes. I am using this with about 80 users, and they are happier with this then they were with exchange 5.

Reply0 replies
Version 6.1
Anonymous Member IconReview

Some of us network admins wear many hats (I wear about 5 in the small ad agency I work for) and don't have time to fiddle with confusing command-line configurations. Kerio is an enterprise-friendly e-mail solution that plays nice with Outlook and Entourage, but it costs WAY less than Exchange. Given those two points, Kerio is worth the money.

2 cents.

Reply0 replies
Version 6.0.9
Rogier Member IconComment+0

I have used Kerio mailserver 6.0.1 6.0.2 6.0.3 and 6.0.4. Since 6.0.3 I had the problem that reminders don't come up in Outlook xp and Outlook 2003. This problem should be fixed in 6.0.4 but it was not. This version of kerio is still buggy. don't use it for large scale networks. Use it up to 3 users. Any more go for a proffesional sollution like exchange.

Reply0 replies
Version 6.0.4
Anonymous Member IconReview

I've been using 5.7 for a while now and it has been bullet proof running on a Redhat 9 server. I just installed version 6 on a test server and I'm blown away. The web interface is absolutely awesome! Thus far I haven't found any major bugs. Just make sure you turn your popup blocker off for your server address. I've also found that Mozilla works the best with the new interface. This thing blows my old Exchange server away! Give me iCal support on the server side via WebDav, and this mailserver will be perfect for every platform out there!

Reply0 replies
Version 6.0
Jonas Member IconComment+0

Account folders missing

I've installed the demo of Kerio Mailserver and setup the domains and users. But when I login on an account via the web I get an error:

The following error has just occured: Cannot open folder

It cannot open any folders for any account! Is there something I've been missing when reading the manual while setting up the server?

I like this server very mutch because it's simple and powerfull.

Hope anybody knows what I've done wrong or missed!

Thanks in advance,

Reply1 reply
Version 5.7.6
Anonymous Member Icon


Did you change the date on your computer AFTER you installed the server? If so it won't let you open the folders because it thinks the date is wrong. If you are running the demo version, look at the controls and check to see what your expiration date is and make sure your computer date is AFTER that date otherwise it won't work.

P.S. You will probably have to delete the mail account and then re-add it after you fix the date problem.

Anonymous Member IconReview

I've been looking for a mail server for jaguar that is is loaded with options, easy to configure, and very powerful. This e-mail server works tons better over the builtin one with jaguar server. Also, on their site there is a 30-day unlimited user trial version which works great. On a side note you can remote admin it through the kerio admin console cross-platform which is very nice. Only flaw I found so far is that the admin console likes crashing after using it for awhile.

Reply0 replies
Version 5.7.4
user icon+17
Version 8.3.1
user icon+0
Matthias Schumann
Version 8.2.1
user icon+1
Version 7.4.0
> 5 7


Current Version (8.x)


Downloads 26,623
Version Downloads 142
Type Internet / Servers
License Updater
Date 26 Jun 2014
Platform Intel 64 / OS X / Intel 32
Price $465.00
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