Windows XP and Vista: No Office 2013 for you - Computerworld

I'm guessing XP and Vista users weren't going to be first in line for Office 2013 anyway...

"Users running those operating systems will not be able to advance beyond Office 2010, the suite that launched about seven months after Windows 7.
The omission of the two operating systems means that more than half of all Windows computers -- 54.6%, to be exact -- now in place will be locked out of the upgrade, according to statistics compiled by Web metrics company Net Applications."

Windows XP and Vista: No Office 2013 for you - Computerworld