Web Mail Interface for My Mail Server

Hi guys,
I was wondering if someone can help me out here. I am running
hmailserver on windows xp and i would like to setup a webmail interface
on my server so that my users dont have to use outlook to check emails
and can just use thier browsers to do so. I was wondering is there any
free plug in available to do something like this?

I googled it but everything is php scripts etc and nothing seem to be
the right thing.

Thanks a lot guys!!!.