Exchange 2010/2016 coexistence

We currently have an Exchange 2010 environment with a single 2010 CAS server.  Is it possible to add two 2016 servers in a dag to the Exchange 2010 environment?  We have no plans of upgrading or adding another CAS at the moment.
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Jose Gabriel Ortega CastroCEO Faru Bonon IT - EE Solution ExpertCommented:
No, the DAGs requirements say that it should be the same version of OS, and exchange version in everything (Edition,Build,SP, etc)I.
So if you still want to go that way you should go using 2010 servers.
But since they are out of support I'd recommend you to go Migrate 2016 and then work with DAGs under 2016, it's the best way to go here.

Here's Exchange 2010 step by step guide:

Prerequisites (for site resilience)
Pure Exchange 2010 organizations (no coexistence with Exchange 2003/2007)

Consists of two datacenters (both with Internet connectivity)
No proxy sites (AD sites with no Internet connectivity)
Uses split-DNS (same namespace internally and externally)
An Active Directory site in each datacenter (no spanned AD sites)
Each DAG includes member servers from each datacenter (stretched DAGs)
Hardware Load Balancer deployed in each datacenter
SAN certificates are used (no wildcard certs)

Here are some scenarios:

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exchsvrAuthor Commented:
Thanks for your reply. Can we add a single 2016 server by itself?
MASEE Solution Guide - Technical Dept HeadCommented:
Exchange2010 is end of support by Jan2020. As commented above please consider Exchange2016.
FYI Exchange 2019 will be released by mid of 2018.
Now you can add a new 2016 server and move all your mailboxes and configure coexistence.
Dont forget there is a difference in protocol used by both versions of Exchange. But your outlook interface should be Exchange2016.
It will proxy/redirect traffic to 2010.

Please install Exchange2016

The moment you installed Exchange 2016 install certificate to avoid certificate errors in outlook.
MASEE Solution Guide - Technical Dept HeadCommented:
Enough information to confirm answer.
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