If an Excel document is opened and closed while not connected to the internet, the Esri Maps tab is not present on the ribbon when it is opened again after connecting to the internet.
This bug is not reproducible in the most recent version of Esri Maps for Office.
対処法
1. Log out from the active Windows session. 2. While connected to the internet, log in again. When the Excel document is opened, the Esri Maps tab is present on the ribbon.