You may want to just rename the Administrator account or hide it from Outlook users. The administrator account
has permissions assigned during installation that would be some what difficult and time consuming to recreate.
I know this is an old question, but I know many people still use Exchange Server 2003 and I would like to give them a solution to this question.
- Go to the Start Menu -> Administrative Tools -> Active Directory Users and Computers.
- On the left side column, expand your domain and click on the Users folder.
- Right click on the user (in this case, the Adminstrator) that you would like to hide from the Global Address List (GAL), and click Properties.
- Click the tab named Exchange Advanced.
- Make sure the box is checked next to "Hide from Exchange address lists."
This will effective hide that user from the GAL and avoid any confusion for end users.
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