Winhttp.dll – Revision History for Windows Vista SP2, Windows Server 2008 SP2 and Windows Small Business Server 2008 (SBS 2008)

16-Nov-2011 – 6.0.6002.22742 – Winhttp.dll – x86/x64 – http://support.microsoft.com/kb/2585542 – MS12-006: Description of the security update for Webio, Winhttp, and schannel in Windows: January 10, 2012

16-Nov-2011 – 6.0.6002.18541 – Winhttp.dll – x86/x64 – http://support.microsoft.com/kb/2585542 – MS12-006: Description of the security update for Webio, Winhttp, and schannel in Windows: January 10, 2012

24-Aug-2009 – 6.0.6002.22208 – Winhttp.dll – x86/x64 – http://support.microsoft.com/kb/971737 – Description of the update that implements Extended Protection for Authentication in Microsoft Windows HTTP Services (WinHTTP)

24-Aug-2009 – 6.0.6002.18096 – Winhttp.dll – x86/x64 – http://support.microsoft.com/kb/971737 – Description of the update that implements Extended Protection for Authentication in Microsoft Windows HTTP Services (WinHTTP)