These attributes are managed within the local Active Directory; by removing your Exchange servers and their management tools, you may inadvertently remove the ability to edit the Exchange-specific attributes in Active Directory.
Adding new email addresses via ADSI Edit or Active Directory Users and Computers Attribute Editor isn't something to look forward to -- unless you're looking for a challenge.
Active Directory is Microsoft's trademarked directory service, an integral part of the Windows 2000 architecture.
There are several tools included in Windows Server to manage Active Directory in all its aspects.
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One license for each administrator station where our software is installed, no matter how many servers and stations you have to manage! It automatically includes one year of software maintenance and technical support.
The mail objects of the external Active Directory should be available for Outlook users via the GAL of the internal Active Directory.
Vice versa, the users should be able to see the mail addresses (and other information) of the internal Active Directory objects (or a subset) in Outlook.