Many Excel tools are optional extras, but these six are essentials I rely on in every workbook.

Have you ever opened an Excel file and felt a pang of unease? Rows upon rows of data, cryptic formulas sprawled across cells, and a tangle of manual formatting that seems one misstep away from chaos.

"We are excited to announce support for PivotTable creation and editing on iPad. PivotTables allow you to calculate, summarize, and analyze data. We have tailored this powerful tool for the iPad's ...