The Mini 5103 HP sent us packs the new 1.5GHz Intel Atom N550 processor, 2GB of RAM, Broadcom's Crystal HD accelerator, and runs Windows 7 Professional.

ENGADGET: HP Mini 5103 with dual-core Atom N550 performance review

Upgrades will be tier-for-tier, with Vista Home Premium users getting to switch up to Windows 7 Home Premium when the time is right, Vista Business to Windows 7 Professional, and Vista Ultimate users getting an upgrade to Windows 7 Ultimate.

ENGADGET: Windows 7 upgrade details released?

Like we saw last time around, some of the 7-to-8 upgrade rules are a bit Byzantine -- 7 Professional users can't step down to the non-Pro Windows 8 release, for example, and it's equally verboten to change language editions or move from 32- to 64-bit code without a full-scale reinstallation.

ENGADGET: Microsoft reportedly plans Windows 8 upgrades all the way from XP, wants us to just let go of the past