I\'m using powershell to modify some AD extensionattribute.
This is my code to add an extensionattribute
Set-ADUser -Identity \"anyUser\" -Add @{exte
You could try using the -Clear parameter
-Clear
Example:-Clear Attribute1LDAPDisplayName, Attribute2LDAPDisplayName
-Clear Attribute1LDAPDisplayName, Attribute2LDAPDisplayName
http://technet.microsoft.com/en-us/library/ee617215.aspx