[citation][nom]Thunderfox[/nom]Why would there be different versions of it? The only reason the consoles did it was because they cost a fortune anyway and you could save some money by not buying a hard drive. This was a mandatory option for MS to provide considering how they violate you anally with a cactus with the price of the hard drive and all of their other accessories.[/citation]
You don't remember the original PSP, do you?
They had a basic pack, which was basically the unit, charger, headphones and a demo disc.
Then there were a value pack, which also contained a 32MB memory stick and a soft cover.
Then they had the mega pack, which also contained two games and a 2GB memory stick instead of 32MB.
It had absolutely nothing to do with Microsoft, my guess would be it was because of one of it's competitors, such as the Nintendo DS.