Excel 2007 tip #1: Make your data visible to other Excel users by saving in Excel 97-2003 format. By David Carter

Files produced by Excel 2007 are in the new .xlsx format. No other version of Excel can read them unless a special compatibility pack has been installed.

If you plan to share your Excel 2007 files with other Excel users, set Excel 2007 to save your files automatically in Excel 97-2003 format. This will allow other Excel users to read them.

How to set Excel 2007 to automatically save files in Excel 97-2003 format:

Start up Excel 2007.

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