Technical Specifications

The OpenProtocols Connector allows Microsoft Outlook® to integrate with some of the largest messaging systems in the world, via open protocols (CalDAV and CardDAV), providing the highest level of Outlook integration.

An Outlook plugin that uses open protocols like CalDAV, CardDAV to provide the highest level of Outlook integration.

Message Platform Connectivity Examples

The following table lists a number of messaging platform providers along with the features available through the OpenProtocols Connector. Many of these providers are in the process of building support for the OpenProtocols Connector into their platforms (you may wish to use the status report within the connector to verify the level of functionality provided).










Global Address List

Apple iCloud
Apple Calendar Server
Open-Xchange App Suite
Oracle (OCUCS)
* Dash denotes that the feature is not applicable to the nominated service.
* Question mark denotes an unconfirmed status, please check with vendor.
* Cross denotes that the feature does not appear to be available (and may not be fully available within Outlook).

* All messaging platforms named above are respectively trademarked by their owners. If you wish to submit a platform, please use the feedback form submitting the status report (and we will review and update the above matrix).

Outlook® IMAP Comparison

The following table provides a comparison between Outlook® when configured using IMAP, and Outlook® configured using the OpenProtocols Connector.

Feature IMAP OpenProtocols
Email Messages
Email Folders
Server Contacts
Server Calendar
Server Tasks
Contact Groups
Global Address List
Server Notes
Integrated Free Busy
Public Folders
Offline Support

Generic Functionalities

The following table outlines the functionalities that the connector provides via IMAP/CalDAV/CardDAV/SMTP protocols.

Feature Implementation Description
Calendar CalDAV The calendar folder is located and transacted through CalDAV.
Contacts CardDAV The calendar folder is located and transacted through CardDAV.
Tasks CalDAV The connector will query the calendar home set for a folder that is a calendar resource, and refines the search by testing if the folder name controls /Tasks/.
Message Folders IMAP Folders are delivered to the client via IMAP using the LIST command.
Message Notifications IMAP The connector will use IDLE if it is available. If it is not available, then it will issue NOOP commands to the server every 20 seconds to check for changes. Folders are subscribed by a listener once they have been activated by the client GUI.
Contact Groups CalDAV -
Global Address List CalDAV The Connector will provide a Global Address List if the backend service publishes a Global Address List as a DAV collection.
Notes IMAP Notes are implemented as an IMAP folder called Notes.
Free/Busy Support CalDAV Scheduling The connector queries for the Scheduling Outbox supported by the CalDAV server and issues free and busy requests to the server.
Sharing IMAP ACL, IMAP Other NAMESPACE and CalDAV The Connector provides sharing via IMAP ACL/IMAP NAMESPACE and CalDAV calendar-proxy support.
Public Folders IMAP Public NAMESPACE This is implemented via IMAP NAMESPACE,
Offline Support Connector The connector maintains a transaction of message operations and replays these operations once connected online
Notes IMAP -

Extended Functionalities

The following table outlines possible supported functionalities, if the service provider provides extensions beyond those defined in OpenProtocols (IMAP/CalDAV/CardDAV/SMTP).

Feature Implementation Description
Out Of Office Extension The Connector will not provide this unless the backend service has a specific extension to do so
Move Folders with SubFolders and Content IMAP -
Copy Existing Folder Structure and Contents to a New Folder Requires IMAP X-COPYFOLDER Extension Without the extension, the operation is denied. The workaround for the user is to make a new folder and copy contents into the folder. ie: the limitation is just copying a folder hierarchy and inclusive messages. When a client attempts to do the operation, they will get an error saying that the copy operation could not be performed

Try It Out

Download and try the OpenProtocols Connector now!




* Microsoft, Outlook, Exchange and Windows are either registered trademarks or trademarks of Microsoft Corporation
in the United States and/or other countries.