Earlier today, the Hyper-V team released several Hyper-V updates as a single update package via Windows Update. These updates have been publicly available for some time now, but now they are available packaged together as a single roll-up for the convenience of customers.
There are three issues resolved with this update:
- Compatibility with Intel Nehalem Processors
- Compatibility with Intel Westmere Processors
- A network issue when, under extreme network load, the VM network connection is lost.
For specifics on the issues resolved with this update, please see this KB article http://support.microsoft.com/kb/2264080