Exchange for Mac OS X Server?

Hi,
I love Mac OS X server, but i cant find that many good middleware solutions for it.
I use it to administer a bunch of macs, and host sites aswell as streaming media.
But im looking for something like

Exchange (email/collaboration server)
Live Communications Server (im server)
Sharepoint (portal server)
Voip/Telophony Server
Smart card

any ideaas

OS X Server has a built-in Jabber/iChat server for IM. (And the blojsom blog-hosting package on that page might be useful to you, as well.)

For your other needs, you could buy a third-party solution (CommuniGate Pro Server for example, but there are complaints about the cost on the web; it's an annual subscription) or build one from open-source components (which can be a bear to set up.)