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Can I name my 2019 exchange server at any time?

So I am migrating from Exchange 2013to Exchange 2019.
Can I run through the install and all migrations and then name my new exchange 2019 the same as the previous exchange 2013 device name?

So mail1 = 2013, while new exchange is default name...do the install, migration and then rename new exchange mail1.

Can that be done?
Or do I have to pick a new mail server name and stick with it?
We just have a bunch of references to the mail1 name and I'd like to skip finding all the references.
Thanks in advance.

office-exchange-server-administration
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AndyDavid answered BCL-4181 commented
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So I basically need to name the 2019 exchange server before starting the exchange install.
Is that about right?

I can always change the IP at a later time though...right??
Thanks. B

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Correct, name it now - anything but an existing server -
and you are good.

You can change the IP address of the server anytime later, yes. Just make its updated in DNS as well to reflect the correct IP to NAME

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Ok, looks like we already installed exchange 2019.
What are my options? If was left with the default name...
Can I uninstall exchange , rename the device, then reinstall exchange?
Looks like we haven't done anything except install the new exchange on the new server.

Will uninstalling it have any adverse affects on the AD changes that were made?
Thanks again.

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AndyDavid answered AndyDavid commented

If this was the first 2019 server, that is expected. Do you really need to reinstall?
Otherwise, I would bring up a new 2019 server instead with the name you want and move the 2019 arbitration mailboxes to it, then you can remove the first 2019 server

get-mailbox -arbitration | new-moverequest -targetDB <New2019DB>

I would not move the 2019 arbitration mailboxes to the 2013 server.

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This is the only 2019 exchange server.
what are the arbitration mailboxes? Can I just ignore them (or remove them) uninstall exchange, redo the os, rename the server and reinstall exchange2019?
Wouldn't those arbitration mailboxes reappear in the new exchange as well?

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They are the system mailboxes.
They can be recreated, yes, but you could also break something if you remove.
I would not mess with them and bring a new 2019 server instead, then move them to the new server, then remove the first 2019 server - that is the cleanest and safest way to handle this.
If you decide to remove them, you can recreate following:

https://docs.microsoft.com/en-us/exchange/architecture/mailbox-servers/recreate-arbitration-mailboxes?view=exchserver-2019

More about these system mailboxes:

https://blog.rmilne.ca/2018/03/19/arbitration-mailboxes-lay-of-the-land/

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Crap, nothing is easy...
So if I were to just wipe out the existing 2019 server, and start over I could possible break the working 2013 exchange...

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BCL-4181 answered BCL-4181 commented

haha...lets hope...

so I haven't done anything yet, so lest say I will be leaving the name as is...
I just tried a few cmds and they don't return anything...
Get-Mailbox -server New server
Get Mailbox - database new server database

Just returns me to the next line, no data at all...is that to be expected?
I assumed there would be something due to the error....

Oh, and to get out of the precheck, can I just click teh X in the upper right corner and I'm good?

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You wont see anything with that command till you create user mailboxes

 get-mailbox -arbitration -database <new server database>

will show the system mailboxes



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so if I run that against the exchange2019, that I tried to uninstall it'll show me teh system mailboxes?

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yes, it should

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