Kopano is a full groupware platform, containing email, messaging, web meetings, calendaring, and collaboration. It is also a full drop-in replacement for Microsoft Exchange, supporting ActiveSync (via Z-Push) and mobile device management.
Nightscape is a Kopano partner, allowing us to obtain licensing and support for your organization. We use Kopano internally, and it is a very impressive Open Source product.
For more information on the Kopano Groupware Platform, you can view the official brochure by clicking here.