Kerio Connect

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Kerio Connect
Developer(s) Kerio Technologies
Stable release 9.0.3 / April 14, 2016 (2016-04-14)
Operating system Windows, OS X, Linux
Platform Personal computers, virtual appliances
Type Groupware
License Commercial proprietary software

Kerio Connect is a commercial mail and groupware server developed by Kerio Technologies. It runs on Windows, Linux and OS X. The product was named Kerio MailServer until version 6.7.[1]


Its features include encrypted access using SSL, anti-virus and anti-spam protection, native over-the-air handheld synchronization, webmail interface, connector for Microsoft Outlook and groupware features.

Administration is by a web browser.

Messages are stored on the server as individual files with separate index files. This contrasts with systems such as Microsoft Exchange which use a database to store messages.

The Kerio Connect product itself utilizes several open source products, including OpenSSL, SpamAssassin, PHP, and Qt.

Third party apps[edit]

  • Responder for Kerio Connect is a third party app for iOS devices made as a value-add for Kerio Connect users.
  • Billing module for Kerio Connect and WHMCS by R1apps is a third party plugin for WHMCS for selling and provisioning email account on a Kerio Connect server or Kerio's Cloud service.
  • Email Phoenix for Kerio Connect is a third party service or application for replicating a Kerio Connect server.

Supported clients[edit]


Native support for full groupware (including calendar) features exists for these clients:

Mail only[edit]

Kerio Connect Hosting (SaaS)[edit]

Kerio Connect can also be purchased as a hosted service (Software as a service - SaaS) from a number of providers.[3]

Release history[edit]

Kerio MailServer[edit]

Version Release date Significant changes
5.0[4] November 19, 2001 initial release
5.1 April 12, 2002
5.5 November 26, 2002 Active Directory integration
5.6 March 25, 2003 Open Directory integration
5.7 September 26, 2003 fax plugin
6.0 July 22, 2004 groupware features (shared calendar, contacts, tasks, etc.), MS Outlook integration using Kerio Outlook Connector, new re-vamped WebMail, new SpamAssassin engine, learning Bayesian filter, new backup and recovery, migration tool from MS Exchange, SMTP routing for multi-location deployments, new non-commercial blacklists
6.1 July 18, 2005 WebMail mini, support for Mac OS X v10.4 (Tiger), Kerio Synchronization Plug-in for Outlook, contact synchronization with Apple Address Book, support for Apple iCal, improved and enhanced anti-spam filtering, Sender Policy Framework, HTML editor in new mail composer in WebMail, free/busy dialog in WebMail, Web Administration interface for domain administration
6.1.2 December 15, 2005 Added support for Entourage 2004 SP2 (11.2.1)
6.2[5] July 18, 2006 Two-level spam rating, Distribution lists, Sticky Notes, antivirus plug-in for Clam AntiVirus, universal binaries on Mac OS X, visual marker to WebMail drag'n'drop
6.3 November 7, 2006 Over-the-air synchronization with Microsoft mobile devices via ActiveSync
6.4 May 15, 2007 Support for Windows Vista and Outlook 2007, Windows Calendar synchronization, more ActiveSync devices, iSync connector, BlackBerry support via NotifyLink, DataViz's RoadSync client
6.4.1 July 24, 2007 Added synchronization with iPhone
6.4.1 August 7, 2007 Kerio MailServer virtual appliance
6.4.2 November 27, 2007 Support for Mac OS X v10.5 (Leopard) and Safari 3
6.5 February 19, 2008 Kerio Outlook Connector with offline mode. CalDAV support.
6.5.1 May 12, 2008 Support for Windows Server 2008.
6.5.2 July 15, 2008 Support for iPhone 3G and 2.0.
6.6 October 21, 2008 New Web Administration, better iPhone support, ActiveSync 12, tool for massive Outlook Connector deployment, enhanced iCal integration, ability to auto delete old mails, resource scheduling, support for CentOS and Firefox 3.
6.7 May 12, 2009 Global Address Book, IMAP migration tool, support for Ubuntu and Debian.
6.7.2 September 24, 2009 Support for Windows 7 and Mac OS X Snow Leopard.

Kerio Connect[edit]

Version Release date Significant changes
7.0 February 9, 2010 Distributed Domains, CardDAV, full web-based administration, ESMTP message submission, support for Nexus One, Palm Pre, HTC Hero and DROID
7.0.1 April 7, 2010 Support for Nokia N900
7.0.2 June 10, 2010 Outlook 2010 support
7.1 August 3, 2010 Native support for BlackBerry Enterprise server, public/shared folders on mobile devices, new Sophos antivirus, new retention policy, Safari 5 support
7.1.1 September 15, 2010 Support for HTC Desire and HTC Bravo mobile devices
7.1.2 October 25, 2010 Support for IMAP accounts in Microsoft Outlook 2011 Mac
7.2 May 24, 2011 Full Support for Microsoft Outlook 2011 Mac, Calendar scheduling enhancements
7.3 November 8, 2011 Schedule Out of office replies, Official Support for iOS 5, Support for Microsoft's Auto Discovery service, Global Address List synchronization populates public contacts with SSL public key and photo from directory service
7.3.1 December 8, 2011 Support for Windows Phone 7.5
7.4 May 2, 2012 User access policy, Full web administration on iPad, Improved antispam, official support for iOS 5.1.x
7.4.1 May 15, 2012 Added support for Ubuntu 12.04 LTS
7.4.2 July 11, 2012 Support for Mountain Lion OSX 10.8
7.4.3 August 22, 2012 Added support for iOS 6
8 December 4, 2012 New features: Kerio Connect Client, Kerio Greylisting Service, SMTP security features
8.0.1 February 19, 2013 New features: Added support for Windows Phone 8, added option for PCI DSS compliance
8.0.2 March 21, 2013 Fix release
8.1 April 30, 2013 native 64-bit support, InstantMessage Server, support for Outlook 2013 Click-to-run edition, EOL of Blackberry Connector, Exchange ActiveSync (EAS) becomes a paid extension
8.1.1 June 23, 2013 Added support for Debian 7.0 "Wheezy", Support for Sony Xperia Z
8.1.2 July 1, 2013 Improved performance of shared calendars' synchronization over CalDAV, fixed problem with synchronization of VCard changes in Instant Messaging server, more efficient conversion of attached messages sent via Exchange Web Services.
8.1.3 August 15, 2013 Added support for Microsoft Office 2010 SP2, fixes issue with disappearing public calendars in iCal/Calendar
8.2 October 8, 2013 Added compatibility for iOS 7, added delegation support, added support for multi-user/group chat in Instant Messaging, added Sender Anti-Spoofing security feature, added DKIM, added password policy
8.2.1 November 11, 2013 Auto-configuration tool is now compatible with OS X 10.9 (Mavericks), Accepting invites via Exchange ActiveSync is now reflecting in Kerio Connect client, Order of subscribed shared calendars in Apple iCal/Calendar list is now preserved, several other fixes
8.2.2 December 17, 2013 Added support for default event alarms in Apple Calendar on Mac OS X 10.9 Mavericks, Added support for Microsoft Windows 2012 R2, several bugfixes
8.2.3 March 17, 2014 Open Directory user authentication uses Pluggable Authentication Modules (PAM), Improved stability of Kerio Connect, Memory consumption has been optimized, Apple Contacts could display shared contacts instead of personal contacts, Mac Autoconfig Tool could not install configuration profile on Mac OS X 10.9 (Mavericks)
8.2.4 April 9, 2014 Addressing the "Heartbleed" OpenSSL problem
8.3 May 20, 2014 Support for digitally signed and encrypted messages (S/MIME) in Kerio Connect client (Webmail), Creating domain footers with automatic user and company details, Managing Exchange ActiveSync devices from Kerio Connect client, multiple accounts into a single profile of Kerio Outlook Connector (Offline Edition) in Microsoft Outlook, dropped support for Mac OS X 10.5 Leopard
8.3.1 June 23, 2014 Added: support for certificates with multiple email addresses, support for certificates where email(s) are defined in the subject alternative name field; Fixed: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 did not exist, Weak SSL ciphers were disabled for IM service, Fixed several Exchange ActiveSync stability issues, Plain text e-mails with certain invalid character encodings were generating a lot of Exchange ActiveSync errors into the server error log, Some e-mails signed in Kerio Connect client were corrupted in MS Outlook 2013, Plain text messages were displayed in a single line on some mobile devices, The attachment filter might work incorrectly in some cases, Apple Mail sometimes displayed an error dialog when deleting e-mails in IMAP account, CalDAV SSL connection was incorrectly configured with Account Assistant on Mac OS X 10.9.3.
8.3.2 August 11, 2014 Added: Delegators can choose whether they want to share their INBOX folder now, Cross-domain sharing is again possible in this version, Number of connections to directory servers has been significantly reduced, There is no limit for the number of domains mapped from directory server(s) any more, Microsoft ActiveSync protocol implementation has been improved. Fixed: Read flag was sometimes displayed incorrectly, minor issue in CalDAV, Fixed a bug in Microsoft ActiveSync push notification implementation, Fixed several stability issues.
8.3.3 October 16, 2014 Support for Apple Mac OS X Yosemite, S/MIME encryption for iOS8 profiles.
8.3.4 October 23, 2014 OpenSSL library upgraded to version 1.0.1j to prevent MITM protocol downgrade to insecure SSL 3.0 protocol (CVE-2014-3566 "POODLE")
8.3.4 patch 1 October 24, 2014 Fixed an issue with failing outbound secure connections.
8.4 December 3, 2014 primary changes in the Kerio Connect Client (aka Webmail 2)
8.5 to 8.5.2 May 18, 2015 Kerio Connect

Added support for Debian 8 Jessie (64-bit), CalDAV clients and Kerio Connect Client can define additional "travel time" for each event in a calendar, Added support for Exchange ActiveSync 14 1, Reply and forward flags are now synchronized via Exchange ActiveSync from iOS devices to the server, OpenSSL library upgraded to version 1 0 1m, Server SSL certificate and Certificate signing request is created with SHA-256 signature, Anti-hammering extended to SASL authentication methods, Informational messages about HTTPS redirection for each HTTP request moved to debug log, For subscribing shared folder in any IMAP client, it is necessary to map it in Kerio Connect Client first, Microsoft Entourage 2004 and 2008 clients are no longer configured with auto-configuration tool, Adding a domain footer into a message sent from Blackberry Z30 could render email body unreadable, Password length limit for POP3 downloader accounts was too low, Fixed IMAP folder synchronization in eM Client, Fixed an issue with accessing shared folders over IMAP, Fixed attachment names containing national characters in Kerio Connect Client, Offline messages in XMPP could be re-delivered after an upgrade to new server version, Fixed couple of server stability issues

Kerio Connect Multi-Server

Users can share folders between multiple servers, Added distributed SpamAssassin version for all servers, Added node monitoring with Zabbix

Kerio Connect Client

Added more formatting options for email editor - fonts, indentation, etc., Support for travel time for events in a calendar, Added new calendar agenda view, Login dialog can be customized in product administration, Added improved calendar printing, Added possibility to create/modify recipient's contact directly from email, Improved mail filters configuration, a new mail filter can be created directly from the message, Mail folders show total number of messages, Internet Explorer pinned app, Possibility to add sender to the spam whitelist, A brand new About dialog displaying product version and contact information, Improved time format configuration in Settings, New notification about password match when changing password in Settings, Forwarded message now contains more email headers from original message,

Kerio Connect Administration

A new Sophos Live Protection option in Antivirus setting, Customizable login dialog for Kerio Connect Client

8.5.3 October 14, 2015 added support for Apple OS X El Capitan (OSX 10.11), added support for iOS 9
9.0 to 9.0.2 February 23, 2016 added: IPv6 support, support for multiple SMTP relay servers, server-side filtering rules, remote update, re-design of Kerio Connect Client (Webmail), old Webmail removed, updated SpamAssassin, multiple SSL certificates (Server Name Indication)
9.0.3 April 14, 2016 added optional Kerio Anti-spam (powered by Bitdefender) plug-in, expansion of EWS debug.log



  1. ^ Kerio MailServer is now Kerio Connect!
  2. ^ Release History
  3. ^ Kerio Hosting Providers
  4. ^ kerio publisher 2.0. "Kerio Technologies Inc. | Kerio MailServer 5 | Release History". Archived from the original on 2005-02-04. Retrieved 2010-05-29. 
  5. ^ "Connect Release History". Kerio. Retrieved 2010-05-29. 

External links[edit]