If you are managing hundreds of SQL Server and you might have organised your Management Studio screen with relevant server groups under Server registration. In this case if a new starter has joined and required to assist you in monitoring all of the SQL Server you are taking care, you wouldn't attempt or anyone to register each of the server when you have nearly 500 SQL instances to manage. Until SQL Server 2000 this was a big problem to import and export the Server instance registations, there wasn't...(
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Read the complete post at http://sqlserver-qa.net/blogs/tools/archive/2007/10/03/export-sql-servers-registration-using-management-studio.aspx