Script Download: UsersAreAuthenticatedInDomainController.zip 
http://gallery.technet.microsoft.com/scriptcenter/Check-out-how-many-users-05a8b499

This PowerShell Script illustrates how to check that how much users are authenticated in Domain Controllers.

In many cases, if user wants to check how many user accounts are authenticated in domain control? Normally, user will search the event viewer for the logon events. There is no direct way to get that information, it will be really time consuming. Now, we can use the script to do it.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery