Organizational unit blank in Exchange admin center

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Sometimes we face error " Organizational unit blank" while creating new mail account in ecp

.The reason why organizational unit is blank is that ECP web application has a limit of not displaying more than 500 organizational units.

Error:

  

 

Please follow the below steps to solve the issue:

Step 1: PLease check the no of  organizational unit whether it has exceeded the default value 500.

                      Command:  (Get-OrganizationalUnit -ResultSize unlimited).count
Step 2: If  more than 500 than please delete some OU which is not necessary or redundant.Otherwise,please modify each servers web.config file (Path: \\<server>\c$\Program Files\Microsoft\Exchange Server\V\ClientAccess\ecp\web.config) by adding the following code.
 
<!-- allows the OU picker when placing a new mailbox in its designated organizational unit to retrieve all OUs - default value is 500 -->
<add key="GetListDefaultResultSize" value="2000" />
 
just before AppSettings end </appSetting>
 
 
 
 
After that it's just matter of opening IIS, finding MSExchangeECPAppPool and recyling it. 
 
 
Do this for every server that holds Mailbox Role.
 
Hopefully It will solve your problem. 
The reason why organizational unit is blank is that ECP web application has a limit of not displaying more than 500 organizational units.

Found on Spiceworks: https://community.spiceworks.com/topic/851417-organizational-unit-blank-in-exchange-admin-center?utm_source=copy_paste&utm_campaign=growth

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