Although the SunOS Binary Compatibility Package and the SunOS/BSD Source Compatibility Package allow you to use applications as they are, you should port applications as soon as possible. Long-term reliance on the compatibility packages is not advised for the following reasons:
The application's performance is reduced.
You will not be able to take advantage of the Solaris 2.6 operating environment's increased range of operations and portability.
Compatibility packages are temporary aids to help sites through the transition.