Microsoft Press Free Books (PDF, English)

Microsoft Press distributes free of charge 2 books in pdf. In English.
Registration is required for downloading.

Windows Vista Resource Kit, Second Edition (I liked it, I want it printed)
By Mitch Tulloch, Tony Northrup, and Jerry Honeycutt with the Windows Vista Team

Microsoft® Visual C # ® 2008 Express Edition: Build a Program Now! (For beginners)
By patrice pelland
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When downloading the file names are wrong, I just renamed the received files to pdf, they open normally.