Updated Exchange Public Folder (vs. SharePoint) Guidance
Public Folders will continue to be supported in the next major release of Exchange Server, after Exchange 2007. The phrase that Public Folders are being “de-emphasized” from previous guidance blog posts, is discussed. Also, there is a list of scenarios and suggested deployment guidance for each storage scenario.
Review the blog entry about this at http://blogs.msdn.com/sharepoint/archive/2008/04/01/updated-exchange-public-folder-vs-sharepoint-guidance.aspx