Excellent they updated this ... I used to say that a when you had an Exchange 2003 Standard Edition FrontEnd you needed to have an Enterprise Edtion BackEnd which is wrong :-| Source http://support.microsoft.com/default.aspx?scid=kb;en-us;818476
Exchange Server 2003 is available in two different editions, Exchange Server 2003 Standard Edition and Exchange Server 2003 Enterprise Edition. You can configure either edition for use as a front-end server in a front-end and back-end server configuration.
MORE INFORMATIONYou can configure both Exchange Server 2003 Standard Edition and Exchange Server 2003 Enterprise Edition as a front-end server in a front-end and back-end server configuration.
Note In the front-end and back-end configuration, the back-end server can run either Exchange Server 2003 Standard Edition or Exchange Server 2003 Enterprise Edition regardless of which edition of Exchange Server is run on the front-end server.
To configure a computer that is running either Exchange Server 2003 Standard Edition or Exchange Server 2003 Enterprise Edition as a front-end server:
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