the browse/search OUs listing when creating a new user is blank.

solution:
edit c:\program files\microsoft\exchange server\v15\clientaccess\ecp\web.config on servers holding the CAS role.

adding following entry: add key=”GetListDefaultResultSize” value=”1000″

source:
https://social.technet.microsoft.com/Forums/exchange/en-US/15b66332-16e5-4c76-a84d-a4221ffa43dc/not-able-to-see-all-organizational-units-when-trying-to-create-mail-objects-in-ecp?forum=exchangesvradmin

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