Hopefully someone can point me in the direction of an MS document that can answer this, or provide an answer here.
Is it an MS supported configuration to use the VHDX hard disk file format for a drive assigned to a 2008 R2 guest VM running on a server 2012 R2 Hyper-V host?
I've found info that states (correctly) that VHDX is only supported in server 2012 Hyper-V (at the hypervisor level) and that it isnt supported in 2008 R2 Hyper-V but nothing as to whether it is supported to use VHDX files with 2008 R2 guest VM's on 2012 Hyper-V......
Fingers crossed someone can give me a definitive answer!
Thanks
Matt