I use windows server 2008r2 with role Hyper-V. The guest system is Ubuntu 12.04 LTC. There is local network between Ubuntu and other machines.
EDIT The main problem for me is that my quest OS is Ubuntu 12.04 LTC. As I know, mouse support is not included in the Hyper-V Linux integration components.
4.2.2.2. Graphics and mouse integration
In Linux and Solaris guests, VirtualBox graphics and mouse integration goes through the X Window System. VirtualBox can use the X.Org variant of the system (or XFree86 version 4.3 which is identical to the first X.Org release). During the installation process, the X.Org display server will be set up to use the graphics and mouse drivers which come with the Guest Additions.
After installing the Guest Additions into a fresh installation of a supported Linux distribution or Solaris system (many unsupported systems will work correctly too), the guest's graphics mode will change to fit the size of the VirtualBox window on the host when it is resized. You can also ask the guest system to switch to a particular resolution by sending a "video mode hint" using the VBoxManage tool.
How can I achieve graphics and mouse integration with hyper-v and ubuntu?
Answer for the first part of the question Today it is impossible
I have vhd file. Can I create a virtual machine from this file in Virtualbox, work with this OS, then create a virtual machine in Hyper-V when all work will be done?