Hi Cesare,
If you're in the U.S. there isn't a requirement
that the qualifying product be the same language
edition as the replacement upgrade product, but
the upgrade product may not recognize the other
product. In that case you can use the free
setup assistance from
http://support.microsoft.com
or you may want to phone Microsoft before buying
http://microsoft.com/worldwide
to check to see how your scenario would be handled.
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Hello, can i upgrade from office 2000 italian language to office 2003 english
language using the version upgrade retail box? <<
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Let us know if this helped you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
Office 2003 Editions explained
http://www.microsoft.com/uk/office/editions.mspx