I have over 4000 users that have not been enable for Exchange in Active directory, when I try to create/enable an exchange account by selecting "Existing User" tab then click Browse and type the name of the user  in search box that I want to enable, it comes up empty. So could it be the limit of users that can be displayed, if so, is there a setting somewhere I can change to increase the limit ? Exchange 2013 using EAC.

We still have a co-existance with Exchange 2010, when I try the same with EMC, no problems but when I user the Exchange Admin Centre, then I cannot get the users by searching.

Hi ,

Please check the below mentioned threads.

https://social.technet.microsoft.com/Forums/exchange/en-US/d9fdfafe-1d19-40d9-963d-7907537b329f/browsing-ou-in-eacecp-displays-no-data?forum=exchangesvradmin

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

Hi ,

Please check the below mentioned threads.

https://social.technet.microsoft.com/Forums/exchange/en-US/d9fdfafe-1d19-40d9-963d-7907537b329f/browsing-ou-in-eacecp-displays-no-data?forum=exchangesvradmin

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=exchangesv