|Official supported support statement:
We support REALbasic 2009r1 and later. Older versions will often work with our plugins but we do not support it officially or test for it in any way.
We support MacOS X 10.4 and later, Windows XP, Windows 2003 Server, Windows Vista, Windows 7 and Linux systems per the specs published by REALsoftware. Plugins will often work for other systems outside of those specs, but we do not support it officially nor test for it in any way.