I have been meaning to make use of this for quite some time but only now have I found employment by a company that produces software that contributes back to the Open Source community in one way or another.
I have now embarked upon what seems to be a well traversed path to a certain point, and that is to develop a *nix equivalent Exchange Server. Where many have given up hope I have been asked to pick up and attempt to move forwad. At this time I am assessing what has been done and how much of each area is complete.
If you are interested in working with me on this please don't hesitate to drop me a line: email@example.com