"Specified directory service attribute or value does not exist" when trying to set Exchange 5.5 custom attributes
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The custom attributes are internally named "Extension-Attribute-1", "Extension-Attribute-2" etc. in the directory no matter what you have called them in Exchange Administrator.

Example
Set Exchange custom attribute 1

Exchange.55.Mailbox.SetProperty %servername2%, %ExchContPath%, %username%, $Extension-Attribute-1, test