Now look what I've just found...
Internet Explorer 7 Release Candidate 1 build number 7.0.5700.6 here
http://www.microsoft.com/downloads/details.aspx?FamilyId=F3D9221D-AA5D-445A-AD03-A6E86B7EB410&displaylang=en
Download link
http://download.microsoft.com/download/0/3/f/03f8d439-0fd0-45eb-92f8-d087a103db43/IE7RC1-WindowsServer2003-x64-enu.exe
Carlos