Windows PowerShell 2.0 is backward compatible with Windows PowerShell 1.0. All the scripts written for V1 should work in V2. If you find instances of broken scripts from v1 please let us know through our connect site https://connect.microsoft.com/site/sitehome.aspx?SiteID=99 However there are few points to be noted: Breaking changes from PowerShell 1.0 · The value of the PowerShellVersion registry
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Read the complete post at http://blogs.msdn.com/powershell/archive/2009/05/06/powershell-v2-backward-compatibility.aspx
Posted
May 05 2009, 06:54 PM
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Windows PowerShell Blog