Please Note: The original text of this post was posted by someone else then the apparent author.
Before requiring PHP5 this project started as a major refactoring of the XOOPS 2 core, and some of the work that has been made for it could be released as part of a future XOOPS 2.X version.
So in fact you may not have to wait for the global adoption of PHP5 by hosting companies to enjoy them.
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, XXXXX@sapo.pt and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.