The SharePoint option is only valid if there is a SharePoint server operating on your network, and by inference that would be an Enterprise level application, not a desktop application.
The following is a quote from the Microsoft SharePoint page.
What is SharePoint?
Microsoft Office SharePoint Server 2007 is an integrated suite of server capabilities that can help improve organizational effectiveness by providing comprehensive content management and enterprise search, accelerating shared business processes, and facilitating information-sharing across boundaries for better business insight. Additionally, this collaboration and content management server provides IT professionals and developers with the platform and tools they need for server administration, application extensibility, and interoperability.
