The introduction of PowerShell was a major improvement for all administrators who are not afraid of the CLI. However, it also has some drawbacks. For instance, it is not included in the OS and it lacks many features. Microsoft wanted to correct those shortcomings. PowerShell Version 2 is now a part of Windows 7 and Windows Server 2008 RC2 and offers many new Cmdlets. One area that was improved is the management of the Active Directory (AD).
If you want to use these new features, you have to add the Cmdlets first. PowerShell v2 is now modularized.
Source : 4sysops
