Having read "Hacking Exposed Windows 2000" (and most of the other Hacking Exposed books), and just started using Windows 2003 Server, I ordered this book with an eager anticipation for what it would reveal on Microsoft's supposedly significantly more secure OS.
The opening chapters were a disappointment and in general a lot of the content had been copied from the previous Windows 2000 edition, often with just "Windows 2000" replaced with "Windows 2003", which while sometimes accurate, was more often than not, completely inaccurate.
Many of the example outputs and screen shots didn't match the text and often there were inconstancies in the outputs, suggesting that they had perhaps been hand crafted.
In general the editing was poor and this book didn't really come up to the standard I've come to expect from the Hacking Exposed series. It had all the hallmarks of a book rushed to press.
As for Win2003 specifics, there was actually very little. Weather that's because Win2003 is super secure... or just that the author's (and perhaps the hacking community) hadn't really come to grips with the product....
Even the updated Win2000 content was largely pre SP3, which is odd, since SP4 had gone public, well before this book was released (in fact, some of the virus/worm references in the book are post SP4's release).
If you haven't read the Windows 2000 edition, then don't bother, get this one, it has all the content from that edition, plus a small amount of new Win2003 content.
If you've already read the Win2000 edition recently, then don't bother with this one, especially if you're already playing with Win2003. You've probably got most of the Win2003 info already, from MS and other public sources.
I've just started reading "Microsoft Windows Server 2003: Insider Solutions" (ISBN 0-672-32609-4) written by a team of writers who have been using Win2003 in it's pre-beta and early adopter stages. These guys had been using Win2003 since most of us got Win2000! Hopefully this will cover some of the security aspects that are missing in the Hacking Exposed book.