Hi Luc

You can try this macro.  Copy it in to a vb Module and run it.

Sub RemoveAccents()
' Prepare European name for e-mail address
' works on selection
' best to copy the original data and work on copy

Dim i As Integer, c
Dim char As String
Application.ScreenUpdating = False
For Each c In Selection
   c.Select
   c = LCase(c) 'make text lower case

   For i = 1 To Len(c)
       char = Mid(c, i, 1)
       If char Like "[àáâãäåæ]" Then
           Mid(c, i, 1) = "a"
           ElseIf char Like "[ç¢]" Then
               Mid(c, i, 1) = "c"
               ElseIf char Like "[èéêë]" Then
                   Mid(c, i, 1) = "e"
                   ElseIf char Like "[ìíîï]" Then
                       Mid(c, i, 1) = "i"
               ElseIf char = "ñ" Then
                   Mid(c, i, 1) = "n"
             ElseIf char Like "[ðòóôõö]" Then
               Mid(c, i, 1) = "o"
       ElseIf char Like "[ùúûü]" Then
           Mid(c, i, 1) = "u"
       ElseIf char = "ž" Then
           Mid(c, i, 1) = "z"
       End If
   Next i
 ActiveCell.Value = c
Next
Application.ScreenUpdating = True
End

Press ALT + F11, Insert Module, Copy code, Return to workbook.

Select a COPY of the data Press ALT + F8, select the macro and clilck Run

Regards
eter