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We are currently in a state of coexistence with Exchange 2010 and Exchange 2016. Just noticed that the Exchange 2016 mailbox servers are members of the CAS Arrays that were created for Exchange 2010. The Exchange 2016 servers are at least part of the CAS Arrays tied to the respective AD site but wanted to confirm this is expected behavior.
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We are currently in a state of coexistence with Exchange 2010 and Exchange 2016. Just noticed that the Exchange 2016 mailbox servers are members of the CAS Arrays that were created for Exchange 2010. The Exchange 2016 servers are at least part of the CAS Arrays tied to the respective AD site but wanted to confirm this is expected behavior.

Exchange 2016 Mailbox Servers Showing in Exchange 2010 CAS Arrays

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.