Federated Search on File Servers and Exchange Server Public Folders

Question

Hi,

I want to use Federated Search webparts to show up search results from File Share and Exchange Server Publich Folders.
I have few questions in this regard:
a) Do I need to write Federated Search Connector or will I have to create content sources in MS Search Server for above mentioned data sources?
b) How to write .FLD files for configuring federated search for FileShare and Exchange Server Publich Folders?
c) How to configure security for above data sources so that only data valid for currently logged in user is visible?

I will be grateful for any guidance in this regard.

Thanks,
Gaurav