Why are there two Oracle Content storage services when using Microsoft Office?

If you use Microsoft Office 2013 and 2016, you may see an additional Oracle Content storage service account available. This is caused by a compatibility problem between Microsoft Office 2013 and Microsoft Office 2016. If you attempt to add the second account, an error may result that indicates the Oracle Content add-in is not correctly installed. If you use the same version of the software on all your desktops you won’t see this incompatibility.