How to update email address on Server 2012 AD and Exchange 2013

Issue at hand, took on a company that have a few users with the same first initial last name. So we have already created hundreds of Jdoe@domain.com email addresses. Now they want j.doe@domain.com email addresses. What is the easiest way to make this happen? Server 2012 AD and Exchange 2013.
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Josh GarrettNerdAsked:
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brendanmeyerCommented:
create, or modify the email address policy

all the information you will need is in the following link
https://technet.microsoft.com/en-us/library/bb125137(v=exchg.150).aspx
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Will SzymkowskiSenior Solution ArchitectCommented:
I would also agree that the Email Address Policy approach would be the most appropriate method for what you are looking to accomplish.

Will.
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Josh GarrettNerdAuthor Commented:
Would this change all users? We had Company A which wants to keep all of their email addresses as jdoe@ and Company B wants j.doe@, the companies will be using the same @domain.com. What I'm needing to do is either batch update the user accounts in certain OU's or would I change the alias and logon name in each user through ECP? I hope that explained what I'm needing a little bit better. Last time I made changes to the user in ECP, it didn't seem to update the email address and user logon in AD.
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Will SzymkowskiSenior Solution ArchitectCommented:
You can create multiple Email Address Policies. You can then filter them out based on parameters in the CustomAttribute set 1-15. This way you can have different policies applying to different sets of users.

Also creating an email address policy will not remove previous aliases from other Email Address Policies that have been applied in the past.

Will.
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Josh GarrettNerdAuthor Commented:
Ok, I guess that's where I'll run into the issue. I need to change the aliases that are in use now, any powershell command that I could run on OU's to update alias and logon name?
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Josh GarrettNerdAuthor Commented:
I was able to get a decent understanding and set the email policy for that specific OU and everything under it. After applying the policy, I was then having issues with getting j.doe2@domain.com. That meant I just had to find the offending user account already in the OU and remove the "automatically update email addresses based on the email address policy applied to this recipient" check and save it, then go back in and remove the j.doe address so that I could correct it in the newest user. We are keeping a list of which users will stay with their jdoe and not use the j.doe. This has been a confusing battle for sure. Never fun when you merge companies.
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brendanmeyerCommented:
good to hear, I can totally understand, dealt with it a few times.
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Josh GarrettNerdAuthor Commented:
Especially when you're not an Exchange admin, lol. Been winging it and luckily I have the support of y'all to help steer me.
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