离线客户端和消息到azure

I'm playing around with windows azure and I would like to build a clouded server application that receives messages from many different clients, such as mobile and desktop. I would like to build the client so that they work while in "offline-mode", i.e. I would like the client to build up a local queue of messages that are sent to the azure server as soon as they get online.I'm playing around with windows azure and I wou