Compatibility aspects to the S60 platform:

1. Source compatibility: means that the application or a client code can be rebuilt without a need to modify the code.

2. Binary compatibility: means that no rebuild is needed and the application or a client code thus runs on the S60 phone. Potential issues come along when there is a new compiler and tool chain; The S60 3rd Edition introduces new compilation tools (RVCT, GCC EABI), which cause a full binary break.