I received following email from Mike Bikkins.
“How can I connect to SQL Server 2005 or SQL Server 2008 using SQL Server 2000′s Enterprise Manager?”
No. You can not connect with SQL Server 2005 and higher version using Enterprise Manager. You will need SQL Server Management Studio available with SQL Server 2005 and higher version.
Reference : Pinal Dave (http://blog.SQLAuthority.com)