Connector for Microsoft Outlook


The Open-Xchange Connector for Microsoft Outlook® lets users keep their familiar Outlook client when their organization moves to Open-Xchange Server. Users feel right at home working with their Outlook interface while in the background the Connector synchronizes E-Mails, Calendar, Contacts and Tasks, along with Public, Shared and System Folders. Real-time synchronization enables fast response times, so teams can work as efficiently as possible.

The Connector for Microsoft Outlook uses the newly introduced Open-Xchange Universal Synchronization Machine (USM), which saves the client state and manages the data stream between Microsoft Outlook and Open-Xchange connector. USM only processes the data changes, filters them to ensure fast access and holds them temporarily in cache. The connector software used JSON protocol. Within Outlook MAPI is used, of course, to handle the data. USM is sending information on availability of new objects to Outlook using a sophisticated push notification architecture.


You will find the client requirements under OXtender for Microsoft Outlook Requirements


To download the documentation, follow this: Download documentation Connector for Microsoft Outlook

Installation via Open-Xchange Updater

The Open-Xchange Updater is a software tool by Open-Xchange that installs the latest version of Open-Xchange client software on computers running Windows. The Updater automatically informs users of new updates of e.g. the Open-Xchange Connector for Microsoft Outlook. The Open-Xchange Updater can be set to check for updates daily, weekly, monthly, or not at all; in addition, it can download the associated .msi file (the same type used by Installer) to be installed and maintains a history of installed updates. The Open-Xchange Updater consists of incremental updates of the Connector for Microsoft Outlook, Security Updates and Fixes.

Download and Install Open-Xchange Updater

Known Issues

  • After the start of the new OLOX 2 profile, contacts, appointments and tasks will be synchronized
  • Per default server configuration, mails older as one year won't be synchronized
  • Notice and Journal information won't be synchronized. It is possible to export and import the information via the Outlook functionalities

Mail Push

In order to get mail push, either install and configure the package open-xchange-push-malpoll, which is not recommended on large deployments or if you're using cyrus-imap, read the OX_EMail_Push_Introduction instructions on how to set up real mail push with cyrus.

Limitations/differences to MS OL/EX

Feature Description
Server Side Search All items are synchronized to the client, no server search available
Resource Booking Agent Ressources can't be overbooked, Open-Xchange server throws an exception in case of overbooking
Mesage Tracking This feature depends highly on the mailserver capabilities
Delay or schedule sending messages This feature is not available and does not work
Custom fields Currently Open-Xchange only stores standard attributes. The support of all fields is on the roadmap
Client side filter rules Must be triggered manually to be be affective
Plain Text Mail Will be send as HTML
Private, Public and Shared Not seperated in terms of store and synced completely
Time based sync Sync timeframe is: -2 year / + 2 years from today
MS Outlook mail categories/colors vs. OX web UI color flags There is no sync and relation of color flags in OX web UI and MS Outlook color categories. MS Outlook color categories can only be shared between other outlook clients and the OX color flag mechanism works only within the web UI.
Private appointments/tasks Private appointments in OX must not have more than one participant (on the roadmap to be streamlined)