MS Office documents cannot be used as output format for mass data. They cannot compete with the established tools for quick and secure document generation. In addition, each business sector has its standardized exchange formats for data transfer.
However, in some circumstances MS Office documents can be an appropriate and cost-neutral solution. Here some examples:
Depending on your requirements, I can create Add-ins in VBA / .net or applications using Word or Excel as frontends for data from mainframe computers (based on textfile export) or from databases.