I've been the linux guy in many meetings arguing for Exchange/Outlook and AD. Those two tools are best of breed by far. AD is a HUGE standout when it comes to

I've been the linux guy in many meetings arguing for Exchange/Outlook and AD. Those two tools are best of breed by far. AD is a HUGE standout when it comes to centralized AAA controls. Sharepoint is sharepoint. It just doesn't suck as much as everything else.