Exchange 2016 Installation question

I think I already know the answer to this but I want to make sure I'm not missing anything; I'm running On Premise Exchange 2010 and would like to migrate to Exchange 2016. Could I install it without disrupting mail flow? I wouldn't change any DNS records or point any of the clients to the new server just yet.
srenesAsked:
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Pete LongTechnical ConsultantCommented:
Yes - keep you mx records as they are, i.e  pointing to your on-prem Exchange until you want to point them to M$
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ITguy565Commented:
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ITguy565Commented:
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Sunil ChauhanLead AdministratorCommented:
adding a new version of exchange doesn't come into the mailflow, until you move any production mailbox, it will only be used by the exchange for the shadow mail queues.

but it may impact the client access if you happen to have a single AD side, as soon as you install the exchange 2016 with the CAS role, all the autodiscovery request will be referred to the new server for that AD side, and there make sure to update the client access certs to prevent the annoying untrusted certs errors.
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srenesAuthor Commented:
Are you talking about employees using OWA? The only cert I'm using points to our exchange server using the same url, internally and externally mx records, published using TMG 2010. I never set up autodiscovery, btw.
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Sunil ChauhanLead AdministratorCommented:
no people using outlook, you can review certs installed on the server for more information.

get-exchangecertificate

and follow the post here to review the urls.

https://practical365.com/exchange-server/exchange-server-2016-client-access-namespace-configuration/
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srenesAuthor Commented:
Ahhhh I see what you mean. So on the new server, should I just change the URL for Autodiscovery to point to the old server, or all the URLs?
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Sunil ChauhanLead AdministratorCommented:
most of the time its all the urls, if you have allowed users to connect outlook over the internet then you should update URI same as it set on the old server virtual directory.
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srenesAuthor Commented:
Thanks for your help!
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