In the office, we have a Windows Server 2003 system which can be setup for FTP.

I need to sometimes send huge files to clients, but we do not want to use Yousendit or the like due to confidentiality.

Is there a way I can setup some application so that the files can reside on our server and they can click on some link to access/download it? Preferably, the software can even impose a login/password system and notify me when it has been downloaded.