Hi
http://ostatic.com/blog/fedora-11s-ace-in-the-hole-microsoft-exchange-int...
"That is big news for many businesses. OpenChange is the first open
source implementation of the MAPI protocol, and should allow businesses
who want to standardize on free, open source e-mail, messaging and
collaboration products to do so without ditching interoperability with
Microsoft's platform.
We covered several of the other notable features in Fedora 11 here. It
looks like a release to watch."
Rahul