I need a way to host an open source version of Yahoo Briefcase for my school?

Looking for some open source version of yahoo briefcase for my school. I am the tech person and would like for my students to be able to access their personal folders (windows network) over the web. I know there are high dollar pieces of software to do this, but as a k-12 school, there isn't much money. Not afraid of linux, but would rather be asp.