The Zentyal Development Team announced their Zentyal Server 4.1 release. This Linux distribution is based on Ubuntu 14.04.2 LTS to provide the latest stable packages.
The Zentyal Open Source Linux small business server supports natively the Microsoft® Exchange protocol & supports Active Directory interoperability.
This release is completely focused on improving the stability & set of features delivered by the OpenChange module. Zentyal server comes in 2 different flavors: development version, for bleeding edge testing of the latest available features and commercial version for stable production environments.
To migrate from Zentyal 4.0 to 4.1, you only need to upgrade your 4.0 installation to the last available packages once they are released and a button will appear on the dashboard.
You can read the announcement here.