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1. The FAQ section of this site is your best friend. A vast majority of your questions will be answered there.
2. XOOPS 2.2.x is still very much experimental. If you're wanting to produce a production site, I'd recommend version 2.0.13.1.
3. Support for PHP 5 is still experimental as well. If you use XOOPS 2.0.13.1, you'll want to use PHP 4.
Hope this is helpful.
Best Regards,
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.