How to share state between Azure instances?

Question

I want to use a global data for MVC web application running on Windows Azure (e.g. something like a list of users having new messages).

For a normal webapp, I could use some per-appdomain storage like AppDomain.SetData or just static variable. What should I use for Azure instead (cache? blob storage? queues?) and what solution would be the fastest one?

Answer 1

AppFabric Cache is an outdated service... for new developments use Azure Redis Cache.