imp 3.1 is out. at least since july 20 something.. that's when i started looking around for webmail solutions.. one things for sure. at least to a newbie like me, squirrelmail is super easy to install vs imp. because IMP 3.1 requires you to install Horde Framework for it to run..
but just looking at the screenshot. i dont know if it's modded or something, but it looks like a webmail client like yahoo or hotmail.. very different from IMP 2.x.
i'm going to test it out on phpdev that i have on my system.. the server i'm on is still on PHP 4.0.6

but supposedly going to be upgraded soon..
hehe. i might have to turn to someone like you to help me install it.. i'm pretty much winging it when im installing this stuff. dont know PHP or anything. just going by install guides (invision board, phpbb, squirrelmail all have very clear instructions on how to install). horde/imp's instructions are alittle more difficult for me to comprehend..