1. The document discusses a single mail client solution for integrating Lotus Domino and Microsoft Exchange with Liferay that was developed by PRODYNA AG.
2. It describes NABUCCO Groupware, an integration layer developed by PRODYNA to provide Liferay with enterprise-level integration of groupware applications like mail, calendar, contacts and tasks from systems like Lotus Domino and Exchange.
3. The DEILA framework is explained which was used to build the user interface for NABUCCO Groupware and integrate it with Liferay.