We all know that Open Source is making massive inroads into the conventional IT organization, a trend that certainly going to continue its rapid trajectory. Scalix is an open source alternative to the popular exchange server that is a serious contender for replacing this popular email processor. As usual, there are massive benefits - initial cost, TCO, freeing your neck from the upgrade cycle, etc. ,etc. Other options also include Open-Xchange and Zimbra. That the nice thing about open source, you have options, lots of them. And, it's like, free.