How to Access the Exchange (2013/2016) Admin Center (ECP) with Mailbox still on older Exchange

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ExchangeServer

When trying to access the Exchange Admin Center on either an Exchange 2016 or 2013 server with your Admin user account, you could potentially see an error (500 Unexpected Error) or get redirected to an older Exchange (2010 or 2013) and therefore not get access to the Administrative interface, that you were expecting.

This is by design, because you mailbox is still located on the older Exchange server.

The solution to Access the Exchange Admin Center (Exchange 2016 or 2013) is using the URL like this, appending (?ExchClientVer=15.1):

https://FQDNofTheExchangeServer/ECP?ExchClientVer=15.1

About Author

Peter is an Exchange specialist with over 15+ years of experience with Exchange Server and certified Microsoft Certified Master (MCM) and Microsoft Certified Solutions Master (MCSM) on Exchange Server. He has been awarded the Microsoft MVP award, every year since 2007. He is active in the Microsoft community and User Group Leader for CoLabora (a danish UC & Cloud User Group). He works as an Cloud & Infrastructure Architect and Consulent, with primary focus on Exchange, Office 365, Azure and Skype for Business.

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