Actually all 32 bit OS’es can utilize all 4GB including
XPP. The issue with Windows is that it only displays 3.x GB is that the system
reserves some memory for other uses.
More at : http://www.codinghorror.com/blog/archives/000811.html
From: Robert Hall
Sent: Monday, August 25, 2008 2:52 PM
Subject: Re: Windows Vista, not quite alt
Can Vista use all 4 gig?
I know XP can only access 3 gig even with 4 installed.