There is a lot of VHD integration in Windows 7 and Server 2008 R2. We already showed how to boot from VHD but you can also mount a VHD from within a Windows 7 / Server 2008 R2 environment.
Open up Disk Management, you can Right-Click on Computer and choose Manage and then select Disk Management to do this.
Right-Click on Disk Management and choose Attach VHD.
Enter the path to the VHD. You can choose to mark it Read-Only as well. Click OK.
The drive will mount and display in Disk Management. You’ll notice the disk icon is also blue to help you distinguish it as a mounted VHD.
To dismount, Right-Click the disk and select Detatch VHD.
You will be given the option to delete the VHD as well, but it is not the default. Click OK to detatch.