Mepis is mostly Debian based, and it's core concept is to make Linux easier to use. It uses Synaptic for package management, and supplies a few utilities like a X configuration tool to make a few of the overlooked parts of Linux easier to set up.
The full review tells us:
Sometimes going off-label you get the same results as if you had taken the placebo.
I documented why I thought that the use of Mepis 7 as an ELD was probably pretty safe. It probably would be quite good in a non-MS Exchange environment, but since so many shops using MS Exchange, the question has to be asked and answered about how well it would work in that specific kind of shop. For better or worse, it is unlikely that the glass house folks are going to toss out MS Exchange in the near future if they already have it.