It’s easy to share a document you create in Numbers with friends or colleagues using Microsoft Excel on a Mac or PC.
To export a Numbers ’08 document as a Microsoft Excel file:
Numbers converts each table into a separate worksheet in a single Excel spreadsheet and generates a summary worksheet outlining the worksheets into which each table was placed. It also alerts you — with a Document Warning dialog — of any potential conversion errors, but these are usually minor. You should check formulas, however, as some Excel formula calculations may differ from those in Numbers.