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Retrieve an app for Office - Excel - Office.com
Use the Manage My Apps page to check your apps’ status and to retrieve hidden apps.
Refresh the apps for Office list - Excel - Office.com
Refresh your app list to show only your active apps for Office.
Office Store FAQ - support - Office.com
Apps are mini applications that extend what you can do with the new version of Office and SharePoint 2013. For example, with apps you can use Wikipedia without leaving Word or get
Get an app for Excel - Excel - Office.com
Visit the Office store to get apps for Excel.