” In-place upgrade to Windows Server 2012 Standard
If your small business grows and exceeds the 25 user cap in Essentials 2012, Microsoft is for the first time offering an in-place upgrade to Windows Server 2012 Standard. (In the past, you had to do a more complex migration.) I’ve not fully explored this option, but according to Microsoft, this upgrade brings over all of the unique Essentials 2012 features—centralized PC backup, network health alerts, and so on—to Microsoft’s mainstream server, and provides access to Hyper-V. There is one limitation: Many Essentials 2012 features—like centralized PC backups—will still be limited to the first 25 users. But I’m surprised Microsoft’s even allowing this. Now there’s no penalty for being successful.
(And yes, I can already hear the enthusiast’s mind working here: So you’re saying I can get both Essentials 2012 and Hyper-V on one machine by doing an in-place upgrade? Yes. I am saying that.)”
How about we get a little less enthusiastic about putting the HyperV role ON a domain controller there, Paul.
How about you get enthusiastic about the idea of having Windows 2012 as a hyperV parent and then using downgrade rights to install Essentials in one VM. Then use the 2012 key to transmorg yourself past the 25 user limit. (and I didn’t think that the client backup was limited to 25 pcs after the transmorg?) In fact it clearly says support for 75 here: http://technet.microsoft.com/en-us/library/jj247582.aspx
HyperV role should not be on anything but a plain server. Don’t add the hyperV role to a domain controller. Not only does it break the 1+2 server rights (as you just used up one of your official licenses for the thing you stuck HyperV on, it just causes support issues for you.