Azure File Storage is now available as a production quality service. Azure File Storage is a fully managed file share service that builds on top of Azure Table Storage and Azure Blob Storage to provide a fully encrypted, mountable and managed file share.
Key scenarios include migrating existing applications to the cloud which are dependent on SMB file shares. Azure file storage looks like a regular file share to an on premise application so your existing legacy applications could still run on premise while storing large files in the cloud.
Pricing for the service is here.