So far, HP is only offering the new 2133 Mini-Note PC with either Windows Vista Home Basic or SUSE Linux Enterprise Desktop 10. But come May, you will have a third OS option when HP starts to offer Windows XP as well.
Laptop Magazine confirmed the details with HP after seeing that HP lists a Genuine Windows Vista Business downgrade to Genuine Windows XP Professional option in the section on operating systems. Not only will the downgrade (or upgrade as others might argue) be available but a fifth 2133 Mini-Note will be added by mid-May with Windows XP preconfigured.
The price of this new 2133 Mini-Note PC configuration has not been revealed yet.