[tunap]

IIRC correctly, XP brought the 1-way firewall, native USB support and media codecs. Hence the doubling of requirements. The firewall may have come in SP2. Prior to SP2, XP was pretty buggy/useless.

Geeze, how time flies...

[laumars]

Multimedia codecs and USB were in Windows 2000. USB 2 support was in XP SP1 and the Firewall was in XP SP2.

[kasabali]

To be specific, XP has had ingress firewall and SP2 adds the egress counterpart.