If you have been following my blog you might have read this blog post I wrote back in September 2012 about a test drive I performed running a VDI Session-Based Desktop deployment on Windows Azure. Read it here: Running a Windows Server 2012 Remote Desktop Services environment on Azure.
Back then running Remote Desktop Services roles on Windows Azure was not officially supported (yet). Microsoft has recently changed their support statement on this, and therefore running a Session-Based Desktop Deployment on Windows Azure is now officially supported by Microsoft but can however only be licensed using SPLA. The PUR of July 2013 has been updated with the following statement;
Remote Desktop Services. Remote Desktop Services (RDS) Subscriber Access Licenses (SALs) purchased through the Microsoft Service Provider Licensing Agreement (SPLA) may be used to deliver graphical user interface functionality on Windows Azure virtual machines. RDS Client Access Licenses (CALs) purchased through other Volume Licensing programs including the Enterprise Agreement may not be used with Windows Azure virtual machines. Virtual Desktop Infrastructure functionality may not be used on Windows Azure virtual machines.