Q. What are Guest OS Families in Azure?
A. Azure has a number of Guest OS Family versions (at time of writing, 1 through 4).
- 1 - Windows 2008
- 2 - Windows 2008 R2
- 3 - Windows 2012
- 4 - Windows 2012 R2
As time progresses, different Guest OS Families are retired from support in Azure. For example, at this time, Guest OS Family 1 (Windows 2008) has been retired from support as documented at https://msdn.microsoft.com/en-us/subscriptions/dn750850.