Azure, the cloud platform operated by Microsoft, is an high-level hosting environment providing:
- Managed web server instances (Web Worker Role)
- Database services (SQL Azure)
- File storage and distribution (Azure Blob Storage)
- CDN and caching for both the web server instances and the file distribution
- Simple object storage (Azure Table)
- And other related services (less useful for Drupal)
PHP is officially supported on Azure, making the platform suited for deploying Drupal sites.