<div>
Hi. <br />
Adprep is used before the first 2016 machine is promoted.<br />
<br />
A good guide is here:<br />
<br />
<a href="https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/upgrade-domain-controllers" rel="ugc">https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/upgrade-domain-controllers</a><br />
<br />
Follow those simple steps and you’ll have no issues.
</div>


<div>
Thanks for the reply.<br />
<br />
So:<br />
- I have 4 DC servers today, all 2012R2.<br />
- I add a new 2016 server and make it DC.<br />
<br />
So what I don't understand is that:<br />
<br />
Will my old 2012R2 servers:<br />
1. Stop managing logins?<br />
or:<br />
2. Continue to manage logins with the 2016 AD level?<br />
or:<br />
3. Explode in a cloud of smoke.
</div>


Hans Hard

<div>
You do not need to run ADprep...it will be executed by Domain Promotion wizard automatically in background. (You may run if the wizard fails during adprep)<br />
<br />
ADPrep basically adds the extra attributes to the AD Schema needed for windows 2016
</div>


<div>
<div class="content wysiwyg-content">
Hi, this is my first post.<br />
<br />
I plan to upgrade a network with multiple windows server 2012R2 to windows server 2016 like this:<br />
<br />
- First I add 2016 servers (which will then be at the 2012R2 AD level) and move functions to them.<br />
- I make some of the 2016 servers to DC (still 2012R2 level).<br />
- I'm demoting and phasing out 2012R2 servers that no longer have any functionality.<br />
- When all 2012R2 servers are disconnected, I raise the AD level to 2016.<br />
- My question is: Now that I'm going to install my first 2016 server and make it to DC, do I need to run &quot;adprep&quot; on it? If so, how?<br />
<br />
Exactly what function does &quot;adprep&quot; have? What does it do?<br />
<br />
Grateful for any the answers.
</div>
</div>


Hi, this is my first post.

I plan to upgrade a network with multiple windows server 2012R2 to windows server 2016 like this:

- First I add 2016 servers (which will then be at the 2012R2 AD level) and move functions to them.
- I make some of the 2016 servers to DC (still 2012R2 level).
- I'm demoting and phasing out 2012R2 servers that no longer have any functionality.
- When all 2012R2 servers are disconnected, I raise the AD level to 2016.
- My question is: Now that I'm going to install my first 2016 server and make it to DC, do I need to run "adprep" on it? If so, how?

Exactly what function does "adprep" have? What does it do?

Grateful for any the answers.

[Server 2012R2/2016] Do i need to use adprep or not?

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