I went through the following Technet article which talks about one such a interesting question of my favortie "What is happening with public folders ?"
Please find the excerpts "...Exchange 2007 de-emphasizes public folders. Public folders may not be included in future releases, but support for public folders will be maintained through at least 2016. Current Microsoft Exchange customers should plan to migrate to Outlook 2007 and Exchange 2007. We recommend that you investigate integrating Microsoft Windows SharePoint Services with Exchange Server 2007 if you must have an application that supports sharing documents, calendar items, contacts, and tasks and archiving distribution lists. For other customized applications that are being developed, you should use Microsoft .NET .."
For more information, you can have a look at this Technet article.