The Small Business Server is a web based.
The software contains a web interface for administration of the system and an Active Directory based on Samba resp. a groupware based on Sogo. It can be used as SBS for sharing data via Webdav and SMB and administrate website based on Apache. Also it is possible to manage certificate.
The goal of UAS is to provide a bridging interface between parts of a website, allowing for single sign on to websites with several parts, and for user data to be synchronised between them. Authentication can be against any of the connected elements.