Azure is still in early days yet, but it won't be long before they roll out server offerings (likely Windows to start with) and do away with the need for Datacentres all together when you can just virtualise your Infrastructure from Microsoft and provision your services anywhere in the world on their cloud.
They are already doing it with their BPOS Service.
http://www.microsoft.com/online/busi...ductivity.mspx
So its only a matter of time before they do servers too, and Partner with the top ISPs/Hosts to resell and support the Microsoft Infrastructure and product base.