Unable to create an Alias in Exchange 2007

I am running a single forest, single domain network with a single Exchange 2007 Server.

I have a new starter called Emma and have created her AD account of elc and when I added her mailbox in Exchange it allocated her the e-mail of elc2@xxx.co.uk instead of elc@xxx.co.uk. I tried to add an alias in Exchange and was presented with the attached message.
ex2k7-Error.png
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cmlbaeteAsked:
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Andy MInternal Systems ManagerCommented:
This indicates that you already have a mailbox/group called ELC that is using that email address. You can't use the same email address on a server twice so to add it to Emma's mail account you would firstly need to remove it from the ELC account.
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VB ITSSpecialist ConsultantCommented:
If you aren't actively using that ELC mailbox then locate it in the Exchange Management ConsoleRecipient ConfigurationMailbox > right click on the ELC mailbox > PropertiesE-Mail Addresses tab > untick the Automatically update e-mail addresses based on e-mail address policy box > change the elc@company.com email address to something else, e.g. elc1@company.com > click OK > try adding the elc@company.com alias to the other account again.
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PanosMitkasCommented:
Try this
get-recipient -results unlimited | where {$_.emailaddresses -match "WHAT YOU LOOK FOR"} | select name,emailaddresses,recipienttype
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cmlbaeteAuthor Commented:
Thanks all for your posts.

I am aware that you can only have one instance of each alias which is why this has happened but I am struggling to find out what has ELC applied to it
I ran the command posted by Panosmitkas and I can see its been given to a public folder which helps but we have quite a few public folder so I am now trying to locate which public folder its linked to.
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VB ITSSpecialist ConsultantCommented:
You can use these commands in PowerShell to find the Public Folder that the email address is assigned to:
$PFPath = (Get-MailPublicFolder elc@domain.com | Get-PublicFolder)
$PFPath.ParentPath

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cmlbaeteAuthor Commented:
Thanks for that - I will try this when I get in the office tomorrow.
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