What is 6446 value as Custom Attributes in Exchange 2010 and How to remove Custom Attributes in Exchange 2010


We have Exchange 2010 and some of our mailboxes through the Exchange management console have Custom attribute 1: 6446 and Custom attribute 7: domain2.com

1. Do you know what is 6446 ?

2. How can i check and remove the Custom attribute 7: domain2.com via exchange powershell ?

Thanks for your help...
namergSystems AdministratorAsked:
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It's something that was added manually or through some application that uses those Custom Attributes. Has nothing to do with Exchange. It's AD-related attributes, they were there BEFORE Exchange was installed in the organization.
namergSystems AdministratorAuthor Commented:
I guess Question 1 is answered. Thanks Ronin.
Do you have multi-tenant configured on your Exchange?
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namergSystems AdministratorAuthor Commented:
Hmm, multi-tenant ? Not sure what you mean.. sorry i am not an exchange guru
multi-tenant is hosting multiple companies on a single AD infrastructure. In such configurations, various users stamped with the corresponding domain name in some attribute. Different users, different companies will have different domain names.
namergSystems AdministratorAuthor Commented:
Same company but multiple email addresses.
You might be using Address Book segregation, that's why that attribute populated with the domain2.com.
Check some other users, see if any others have a different FQDN. Use PowerShell for that.
namergSystems AdministratorAuthor Commented:
Hmm that is not the answer to my question though
Set-ADUser –Identity user -Clear "extensionattribute2"

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namergSystems AdministratorAuthor Commented:
Hmm I need to do it for 100 uses :o
Get a list of all your users from AD, you can use either username or alias.
And execute:
foreach ($x in (Get-Content C:\Temp\list.txt)) {Set-ADUser –Identity $x -Clear "extensionattribute2"}

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namergSystems AdministratorAuthor Commented:
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