It's really not an issue of offending someone, but of wasting peoples' time. Those who make a habit of cross-posting without either providing links or acknowledging the fact they've already received help on an issue very soon find no-one willing to help them. I have also known a number of people to be banned from some forums for repeatedly breaching this basic convention.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]