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Open an Office document from an email attachment
Office documents attached to email messages appear in the iPhone Mail app as a preview. To open them directly, tap the button in the top right corner and choose the Open in Office Mobile option.
Excel on the small screen
Excel spreadsheets automatically reformat to accommodate the small iPhone screen. The result can be surprisingly readable, as shown here. Note that this workbook includes multiple tabs, which are available with a single tap.
Quickly create a chart in Excel on the iPhone
The Editing options for Excel worksheets in Office Mobile include the ability to create a quick chart, although customization options are somewhat limited.