LMSSML,
i have used squirreloutlook before, simply install it right over your existing squirrelmail if you want. The versions i have found are ususally defaulted to brazilian portuguese, sift through the files and fix this (easy, really, just don't remember exactly how
)
make sure all the paths match, squirreloutlookv1.0.3.xyz is not so easy to remember...
anyway it works and really does not look all that impressive...
seems to me the (not free) "nutsmail" looks much better.
hope that helps