Microsoft's Virtual Machine Servicing Tool (VMST) 2012 is designed to work with System Center 2012 – Virtual Machine Manager (VMM), System Center 2012 Configuration Manager and Windows Server Update Services (WSUS) 3.0 SP2.

VMST 2012 helps you reduce IT costs by making it easier to update your offline virtual machines, templates, and virtual hard disks with the latest operating system and application patches—without introducing vulnerabilities into your IT infrastructure.

Using VMST 2012, you can now service:

• Offline virtual machines in a SCVMM library.
• Stopped and saved state virtual machines on a host.
• Virtual machine templates.
• Offline virtual hard disks in a SCVMM library by injecting update packages.