This document discusses Microsoft cloud services and how they can help with IT capacity management. Using cloud services allows companies to scale their IT capacity up and down based on fluctuating load and demand. This helps avoid under-supply and waste of IT capacities compared to traditional on-premise models. It also reduces initial investments and shifts costs from capital expenditures to operational expenditures. The document outlines different cloud service models from Infrastructure as a Service to Software as a Service and what portions of the stack each model manages. It provides examples of companies using Microsoft cloud services like Windows Azure to power applications and social media experiences.