Oi !
SFTP ou FTPS ?
FTPS :
http://blogs.technet.com/extreme/archive/2007/05/23/ftps-in-iis7-is-sweeter.aspx
http://www2.ntcompatible.com/FTPS_on_Windows_2003_t32174.html
SFTP :
http://blogs.technet.com/mkleef/archive/2007/05/29/ftps-or-sftp-which-one-to-use-whats-the-difference.aspx
http://en.wikipedia.org/wiki/SSH_file_transfer_protocol
Mas essa pergunta seria melhor no fórum do TechNet...
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