Enterprise Manager is not compatible with SQL 2008 or 2012 and will therefore not allow you to connect.
To connect to an SQL 2008 or 2012 server you must use enterprise manager's replacement called "SQL Server Management Studio Express" which is a free download from Microsoft:
SQL management Studio 2008 http://www.microsoft.com/DownLoads/details.aspx?familyid=08E52AC2-1D62-45F6-9A4A-4B76A8564A2B&displaylang=en
SQL management Studio 2012 http://www.microsoft.com/en-us/download/details.aspx?id=29062
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