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After upgrading from Microsoft Office 2007 to Microsoft Office 365, the following error message is received.
Error: Failed to connect to database. An underlying database error occurred. Class not registered.
The computer is missing a Microsoft Office System Driver.
If Microsoft Excel 2007 is not installed, install the 2007 Office System Driver to use for .xlsx files in ArcGIS. If no version of Microsoft Excel is installed on the computer, this driver must be installed before .xls or .xlsx files can be used.
The 2007 Office System Driver can also be downloaded and used for Excel 2010 and 2013.