米田です。
Windows XP Professional SP2c がSystem Builder 向けに提供されるそうです。
といっても、セキュリティーや不具合修正ではなく、結果的に寿命の長いOSであり、売れ行きも十分なため
Product Key 発行余地が足りなくなりそうという事情のようです。
>SP2c to Resolve Shortage of Windows XP Product Keys
>Due to the longevity of Windows XP Professional, it has become necessary to produce more product keys for system builders in order to support the continued availability of Windows XP Professional through the scheduled system builder channel end-of-life (EOL) date of January 31, 2009.
最長である、System Builder で期限は2009年1月末、そこまで持つように広く修正したイメージをWindows XP Professional SP2c 版として提供するようです。
http://blogs.technet.com/backroom/archive/2007/08/09/microsoft-windows-xp-professional-service-pack-2c-release.aspxWhere System Builders Talk Shop... : Microsoft Windows XP Professional Service Pack 2c Release
>Key Dates Summary September, 2007 Windows XP SP2c will be available to system builders from their distributors.
>January 31, 2008 End-of-Life for product availability of Windows XP for all channels except System Builder.
>January 31, 2009 End-of-Life for product availability of Windows XP for the System Builder channel.?