Openchange is a groupware server which intends to provide an Open Source implementation of Microsoft Exchange server. [edit]
As the upcoming release of Fedora 11 approaches--now slated for June 9th--it's starting to look like this new version could make a big difference for a lot of users and businesses. We reported on some of the more interesting features found in the Leonidas Preview, and now a number of other notable features are coming to light, including unprecedented interoperability with Microsoft Exchange. The interoperability features could have implications for many other Linux distributions.