Microsoft released a patch that allows Win7 SP1 and W2K8 R2 SP1 to become valid recognised clients in ConfigMgr.

As a patch, you request and download it, then apply to your Site servers and not to your Site systems. It modifies the entries in the Requirements tab of a Program so that these two platforms are included in the list of platforms available.

These two new platforms will now show up when using the following features: Software Distribution, Software Updates and Desired Configuration Management