Munib Ahmed posted an excellent step by step guide how to run an existing virtual machine on Hyper-V into Virtualbox. http://dynamicsnavax.blogspot.com/2011/04/how-to-run-ax2012-hyperv-on-virtualbox.HTML
This guide allows you for example to run the Microsoft Dynamics AX 2012 R2 Demo VM http://blogs.technet.com/b/dutchpts/archive/2012/12/23/microsoft-dynamics-ax-2012-r2-demo-vm-available.aspx in any workstation or laptop without Hyper-V.
After configuring this virtual machine uand opening Dynamics AX client in the Role Center you will get an error message like this.
The reason for this error message, is due a configuration that is lost by opening it in Virtual Box.
Steps to overtake the issue:
1 – Add a new internal networking card in virtual box
Configure Windows new network card with ip address 10.20.12.101