Active Directory Activations

I am lookikng for a help on Active Directory Activation implementation. It looks pretty simple ad per MS article. But I do not know whether will be any issue when I deploy .
I have few questions and hope someone shed the light on it

We have a KMS at present and have windows 7 activated by KMS.
Can we run both KMS and AD activation together?
Do we have to have KMS in place until we retire the windows 7?
Which activation key we have to use it  for AD activation configuration, is it the old KMS?
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sara2000Asked:
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MaheshArchitectCommented:
Can we run both KMS and AD activation together?
Yes, you can, in fact you must because AD activation only works on win 8 and above and windows 2012 and above server OS

Do we have to have KMS in place until we retire the windows 7?
Yes, that is the only because ad activation cannot be used for win 7 / 2008 R2

Which activation key we have to use it  for AD activation configuration, is it the old KMS?
KMS key should be used based on OS you will be activating
Use 2016 server KMS key to activate all server OS from 2008 to 2016 and win7 to win 10
https://docs.microsoft.com/en-us/windows-server/get-started/server-2016-activation
https://docs.microsoft.com/en-us/windows-server/get-started/kmsclientkeys

I did not see / here any issues for AD activation till date
sara2000Author Commented:
I read the link below. So I have to put multiple KMS keys(Windows 2016 and Windows 10) in the KMS key box, am i correct?
https://docs.microsoft.com/en-us/windows/deployment/volume-activation/activate-using-active-directory-based-activation-client
MaheshArchitectCommented:
you need only one key that is with windows server 2016 product, it will take care of 2016 server and win 10 as well
check the 1st link in last comment
If you get KMS key for 2019 product group, you can use that as well to activate all products from 2019 server to all the way to 2008 and win 10 to win8 I believe

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sara2000Author Commented:
That where  I am confused, if we use Windows 2016 Key then it should cover all below version. Why do we have to have old KMS then?
MaheshArchitectCommented:
Because AD activation service cannot activate win 7 & 2008R2 OS
For those you need kms server
MaheshArchitectCommented:
U need to retain current kms server setup to activate win 7
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