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
LVL 1
cmlbaeteAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Andy MIT 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.
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.
PanosMitkasCommented:
Try this
get-recipient -results unlimited | where {$_.emailaddresses -match "WHAT YOU LOOK FOR"} | select name,emailaddresses,recipienttype
Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.

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.
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

Open in new window

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
cmlbaeteAuthor Commented:
Thanks for that - I will try this when I get in the office tomorrow.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.