Try the following:
Get-ChildItem C:\pstest\hlstore\folder1\data | where-object {$_.lastwritetime -ge "3/26/2010 9:00 PM"} | Copy-Item -destination c:\pstest\hlstore2\folder1\data
The variable name "it" in the where-object is $_ , not $i .
Also, if you use these quotation marks "" instead of "" , I think it will also fail.
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