Due to technical reasons, the ribbon menu is not available on Excel 2007 (PC) and 2008 (MAC). Ideally, if you could upgrade to at least Excel 2010, you will benefit from a much better user experience. However if you can’t migrate from Excel 2007 or 2008 (e.g: company policy) you may still use the Gantt Chart Maker through the right and the left menus that are available on the sheet itself :

Malgré que le menu ruban n’existe pas sur Excel 2007, il est possible de contrôler l’outil depuis les différents menus existant :

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