Exchange is not currently supported here on QnA. They're actively answering questions in dedicated forums here.
https://social.technet.microsoft.com/Forums/office/en-US/home?category=exchangeserver
https://social.technet.microsoft.com/Forums/msonline/en-US/home?forum=onlineservicesexchange
--please don't forget to Accept as answer if the reply is helpful--
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.