Solution : https://service.sap.com/sap/support/notes/1480865 (SAP Service marketplace login required)
Key words :
customize quick access toolbar, symptom ms-excel crash, prerequisites ms-excel crash, ms-excel works fine, ms-excel toolbarfollow, mentioned stepsms-excel 2003 1, mentioned stepsms-excel 2003, add-ins button, add-ins button 5, select ms-excel 2003
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