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Home HowTo Exchange - Outlook E-mail address already exists in exchange 2007 organization

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troubleshooting

E-mail address already exists in exchange 2007 organization

While upgrading a Microsoft Exchange 2007 organization with Service Pack 2, I received following error messages:

exchange 2007 proxy address Questo indirizzo e-mail è protetto dallo spam bot. Abilita Javascript per vederlo. is already being used
and
exchange 2007 Questo indirizzo e-mail è protetto dallo spam bot. Abilita Javascript per vederlo. is not valid for alias

Solution:

Using the Windows 2003 Active Directory Users and Computers utility, right click on the domain, choose Find.
In the Find: dropdown list, choose "Custom Search" and in the In: dropdown list, choose "Entire Directory".
Click the Advanced property page and enter the following LDAP query:

proxyaddresses=smtp: Questo indirizzo e-mail è protetto dallo spam bot. Abilita Javascript per vederlo.

Click Find and you should find the object that already has that SMTP address.
I found that the group which had the proxy address wasn't current Exchange-enabled:

xxx.yyy/Configuration/Services/Microsoft Exchange/IM-SA/Transport Settings/MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e

Pull up the properties in Active Directory Users and Computers and note there are no Exchange tabs.

Solution 1:
Cancel group (after complete backup !!!)

Solution 2:
In ADUC Right-click the offending object >>> Exchange Tasks
Select "Remove Exchange Attributes"
As long as successful all should be done, otherwise see solution 3.

Solution 3:
Install the Windows Server 2003 Support Tools from the Win2003 CD
Start >>> Run >>> ADSIEDIT.MSC
Navigate to the object returned in the steps above. Right-click >>>Properties
Find the proxyAddresses attribute, Click Edit.
Remove the offending SMTP e-mail address.