The right way of deleting a user ID that is not used any more and resiggning to a new user in AD


We have windows 2012 DC and a user  David Cook  (user name DCO) has left our organisation and their account was disabled long ago.
I had not deleted their account and still their mailbox is in the exchange and his name listed in the address book (Outlook Client) we don't need this user any more.

Now and new user has joined  and her name is  Deborah Cook and when I went to create a user name as DCO  for this new user not realising there was already one there was a popup saying:
  "The user logon name you have chosen is already in use in thus enterprise. Choose another logon name  and try again."

I don't need David Cook any more , if I delete him( DCO)  and assign this ID to Deborah Cook, will this cause any problem.

Please let me know if this is a right way allotting the user ID that is not used any more to a new user.

Any help much appreciated.

I remember sometime ago when I accidently deleted a user  and recreated the emails were not working properly.
for this user, when user were sending email from outlook client the emails were not going to the recreated mailbox AND when sent from OWA the mails were working properly and don't want to get into the same issue again.
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
No this will work fine deleting him and reallocating his username.
Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
you will also have the ability to restore his account through the active directory recycle bin if needs be.

Just make sure you reassign the exchange side of it too, its not going to cause an issue either tbh.
if you wanted to be a bit more safe feeling about it archive davids mailbox to pst via exchange shell or just log into his mailbox and do it through outlook and then remove him from exchange completely too.
Amit KumarCommented:
Be sure one thing when you delete old account and assigning same UPN and e-mail address to another account so your DC's must have latest replication, because when you are going to create another account with same UPN and e-mail address and replication is not in place so e-mail address can be changed randomly with suffix of 1 or 2 or any digit.
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Amit KumarCommented:
Agree with Bill as well if user's e-mail data is important then get it exported by configuring outlook or from Exchange shell.
Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
I dont think there is any reason to assume AD replication is off or anything like it, the original steps I outlined suffice here imho.
Amit KumarCommented:
I have faced this thing in my env. with few instances. That is why I shared my opinion if it helps.

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Henrik JohanssonSystems engineerCommented:
Creating new user with same samaccountname/UPN after deleting the old user will create a new unique user with new RID/SID in AD.
You need to remove/rename homefolder and profile folder for old user. The new user will not have the old user's permissions.
Will SzymkowskiSenior Solution ArchitectCommented:
As stated deleting an AD Account In actual fact and re-purposing it will not create any issues. However, in a large environment where you might have multiple users that have similar names like you have stated above (and both accounts are required) you will need to change up your naming convention to accomodate this.

Typically you would use something like first initial last name or reverse. Something like below as an example...

This would be for first inital last name example....
David Cook = dcook
Debora Cook = decook

As you can see that i have used the second letter in the first name to ensure that the accounts do not have the same samaccountname.

You may want to take this into consideration in the future. Because even when a user leaves the company the account still my be required for a period of time before you can remove it.

Even if the account is disabled the sAMAccountName cannot be used.

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