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

You Choose

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

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

People on Mac OS X usually prefer working with its default applications which work beautifully with Kolab Now, but most other MacOS applications work as well. 

Linux users typically use the dedicated Kolab Desktop Client, though some choose to use Thunderbird or Evolution.


The offiical Kolab Desktop Client supports all Kolab features and provides a dynamic, rich, easy to use interface for email, calendaring, notes, to-dos, journals and more. It supports connecting to multiple mail and calendaring accounts at the same time (including non-Kolab Now 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 what about when you find yourself offline?

The dedicated Kolab Desktop Client (or any other offline-IMAP capable 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 to-dos 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 airplanes where the 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.