Ran across this yesterday, thought it may be of interest…
To figure out the installed version of Integrated Guest Services my Hyper-V VMs:
1. Open Device Manager and expand System Devices
2. Right-click Hyper-V Volume Shadow Copy and choose Properties
3. Click the Driver tab and review the Driver Version number. This represents the version number of the Hyper-V Integrated Guest Services.
As I understand it, the Hyper-V Integrated Guest Services base version is 6.0.6001.18000. I am working on a DPM 2007 SP1 project which requires version 6.0.6001.22334. I used this process to check the version installed on the VMs in order to determine if an upgrade was required.
If Microsoft KB959962 has been installed onto the Hyper-V host(s), when you install/upgrade the Integrated Guest Services on the VMs, it will be brought up to version 6.0.6001.22334.