Public Folders and E14 - More Information
As anticipated, Microsoft today released confirmation that E14 would completely support public folders (that being at the current level of implementation - no new features are expected/anticipated). Along with this, they also gave their guidance as to how companies should investigate using PFs vs. SharePoint.
No major disagreement with their guidance - except I believe that PFs provide a significantly better experience for discussion forums than SharePoint does.
See Updated Exchange Public Folder Guidance on the MS-Exchangeteam blog.