Q: How can I quickly view all virtual machines in my Azure subscription that are part of an Availability Set?

A: The following PowerShell code will list all virtual machines within a subscription that are part of an Availability Set.

(Get-AzureService).servicename | foreach {Get-AzureVM -ServiceName $_ } |
Where-Object {$_.AvailabilitySetName –ne $null } |
Select name,AvailabilitySetName |
Format-Table Name, AvailabilitySetName -AutoSize