When running an excel export you have a Microsoft.ACE.OLEDB.12.0' provider is not registered error message

Note this error message will have a different appearance on an end users machine.  This assumes you are the administrator of the web site.

This indicates that you need the Microsoft Access Database Engine 2010 Redistributable on your IIS server machine.  

Note that you will need to select either a 34bit (AccessDatabaseEngine.exe) or 64bit AccessDatabaseEngine_x64.exe) version to download.  

Please note that Excel importing and exporting is and administration function likely to be performed by only one user at a time on the Qsoar system, and is not generally available to normal users.