CloudServices on B-Series Burstable VM
Apologies if this has already been covered (it doesn't seem to be).
In migrating a number of A-Series Classic Cloud Services to B-Series Burstable VMs, it appears that setting vmsize="Standard_B1s" for example is not allowed. The enumerated list in the properties pane for both WorkerRoles and WCF WebRoles also don't show any B-Series VMs.
Have I missed something or are Cloud Services not supported on B-Series VMs, and if so, why?