The virtual machines include Windows Server 2012. The virtual machines in the MSDN DevTest Gallery include Windows 8.
If you purchase an on-premise BizTalk Server 2013 license, you can install BizTalk Server on a Windows Azure virtual machine. The BizTalk Server 2013 license includes installing on-premise and installing on a Windows Azure virtual machine.
Client computers: Limited to operating systems supported by the Microsoft Azure BizTalk Services SDK:
Installing Windows Azure BizTalk Services SDK
BizTalk Service: Completely managed by Microsoft and hosted on Azure. Users focus on the application needs.
Great Table, thanks Mandi..
Thanks a bunch Mandi.