Hi Tammy,
Thank you for the feedback but this does not meet our requirement. The default workbook is only applied if you follow the following menu navigation. File -->Analysis--> Open Data Source.
All our users use the insert menu option in the data source section of the ribbon, which does not apply the default workbook.
If you manually set the default style set it works fine but can’t this be configured with a configuration or registry setting. I can’t expect 500 users to all go and set there default style.