Is there a way to replace the red underlining with highlight instead when 
mistakes appear?

You could do it with vba

With ActiveDocument
    For i = .SpellingErrors.Count To 1 Step -1
        With .SpellingErrors(i)
            .Shading.BackgroundPatternColor = wdColorRed
            .NoProofing = True
        End With
    Next i
End With


-- 
Hope this helps.

Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.

Doug Robbins - Word MVP, originally posted via msnews.microsoft.com

"ouiqui" <ouiqui@discussions.microsoft.com> wrote in message 
news:24B7A46A-20BD-4B0F-84FB-F43BE35A2D0C@microsoft.com...
> Is there a way to replace the red underlining with highlight instead when
> mistakes appear?