Dean,

Try this:

code:
$objCont = GetObject("LDAP://exchangeserver/cn=recipients,ou=sitename,o=org")
if $objcont
? "Bound to LDAP server, Recipients container."
$objcont.delete("organizationalPerson","cn=test")
? "Deleting Test mailbox"
$objcont.setinfo
? "Committing changes to container."
$objcont = 0
goto end
endif

? "Could not bind to LDAP server."

:end
Exit

It works for me on my Exchange 5.5 SP4 box. Hope this helps!
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Breaker