By making the following modification to  <confluence_home>/confluence.cfg.xmlit is possible  to connect to the Microsoft SQL server using windows authentication of the account that the service is running as. 

<property name="hibernate.connection.url">jdbc:sqlserver://<server>:<port>;database=<database>;integratedsecurity=true</property>

Next the appropriate dll associated with the bundled jar is copied to <installation-directory>/confluence/WEB-INF/lib/.

Would it be possible for the dll to be included with the jar file so this last step is not required with each update? The documentation could be modified to indicate this as an addition supported method of connecting to the database.