「FTP to Azure Blob Storage Bridge 」が公開されています。
http://ftp2azure.codeplex.com/
上記URLよりDownloadが可能です。
以下、上記URLから本文を引用して紹介します。
Project Description
Deployed in a worker role and written in C#, the code creates an 'FTP Server' that can accept connections from all popular FTP clients (like FileZilla, for example). It's easy to deploy, and you can easily customise it to support multiple logins.What does it do?
The project contains code which will emulate an FTP server while running as a Windows Azure worker role. It connects to Azure Blob Storage and has the capability to restrict each authenticated user to a specific container within your blob storage account. This means it is possible to actually configure an FTP server much like any traditional deployment and use blob storage for multiple users.This project contains slightly modified source code from Mohammed Habeeb's project, "C# FTP Server" and runs in an Azure Worker Role.
Can I help out?
Most certainly. If you're interested, please download the source code, start tinkering and get in touch!