On the Desktop, Kolab users can choose the tool they are most productive with.


The Kolab Desktop Client supports all Kolab features and provides a dynamic, rich, easy to use interface for email, calendaring, notes, ToDos, journals and more. It supports connecting to multiple mail and calendaring accounts at the same time (including non-Kolab sources), multiple identities and advanced features such as GPG signing and encryption. It does all of this in an interface that is familiar to anyone who has used other groupware clients such as Outlook.

Offline Access

The Kolab Web Application works in every browser on every platform and is accessible from any place that has an Internet connection. But often enough people find themselves off-line.

The dedicated Kolab Desktop Client enables people to be fully productive even without network access. It downloads all data via encrypted connections for lightning fast local access. When sending emails, adding appointments, managing ToDos or writing notes, the Kolab Desktop Client remembers what happened and will synchronize with the Kolab server as soon as it has an Internet connection. This enables people to work in trains or air planes where internet is either not available or expensive.


The Kolab Desktop Client runs natively on Microsoft Windows, Mac OS X and Linux. In addition to sporting the native look and feel, the Kolab Desktop Client also integrates functionally with each platform including use of the native print and file dialogs, support for drag and drop between applications, and more.

Kolab Systems maintains the Windows and Linux ports, offering pre-built certified versions as well as enterprise support to augment the community efforts. This makes the Kolab Desktop Client perfect for heterogeneous corporate environments.


Although, the Kolab Desktop Client is the primary way of connecting to Kolab on the desktop, other programs usually work as well thanks to Kolab's consistent usage of Open Standards. The allows users to use the application that they are most comfortable with.

On Windows this can be Microsoft Outlook connected via ActiveSync. For older versions of Outlook, there are several connectors from 3rd parties. Thunderbird and emClient are also poular choices on Windows.

People on Mac OS X usually prefer working with its default applications using Kolab's native CardDAV, CalDAV and IMAP support, but most other applications work, too. Linux users typically use the Kolab Desktop Client, though some choose to use Thunderbird or Evolution.

Kolab connects all of these programs together so that people can collaborate using the tool of their choice.