Built-in SQL Server is not needed or used. SQL is used internally, but for serving data, such as Shipping, an external database is used so that only select data is made available.
Shipping uses MySQL to share data, such as Addresses and Tracking for orders, only. MySQL has drivers for any systems, including 32-bit, making it ideal for connectivity.
Leave SQL Server in the BigBusiness Server turned off and install MySQL or Postgres. Contact support@bigbusiness.com if you need help with installation or configuration.