Based on this discussion I will explain the current situation to the people responsible of the business decisions of opening Nokia software.
Resolving this request as WONTFIX. We got an internal discussion and there has been a business decision not to open this component. The reasoning is that Nokia wants to concentrate its open development and the development attention in the components developed for the MeeGo platform. libosso-abook is not part of the MeeGo architecture and Nokia doesn't have plans to develop it further.
Resolving as WONTFIX. The Maemo 5 libraries will not be touched at this point unless there are severe issues around them. All the new open development related with SMS is concentrating on the MeeGo OS. The SMS functionality is handled entirely with open source components. See http://meego.com/developers/meego-ar...comms-services for more details.