Microsoft’s MSN business unit is trying to hook customers onto “Kahuna.” Kahuna is code name for an upcoming version of Hotmail that will sport a new style of interface, automatic inbox refreshing and a preview pane that will enable Hotmail users to read and respond to e-mail without ever leaving their inbox.

According to sources familiar with the upgrade, Kahuna is a limited beta that is not heavy on features as of yet. Its interface is known internally as “Wave 11″ and is designed to be lightweight and “clean” for better performance.

Further integration with MSN Spaces and Messenger is said to be forthcoming.

Source: eWeek