FAQ: Q30

Link: http://www.ilopia.com/FAQ/FAQ.aspx?id=30

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Can I upgrade across languages?

No, you cannot upgrade across languages. For example from a Swedish version to an English version. Multilingual User Interface-enabled servers can however be upgraded by the English version.

Link(s):

Windows Server 2003, Windows XP & Windows 2000 MUI
http://www.microsoft.com/globaldev/DrIntl/faqs/MUIFaq.mspx