Windows Server 2003 R2 build 3790.1711


 * Most probably the first R2 build leaked through Connect.
 * Known to exist in x86/x64 isos.
 * The ISOs from MS Connect were also released by WiNBETA.
 * This possibly came with Server 2003 SP1 build 3790.1289.
 * A quick google search tells me this is R2 beta1.

Therefore this is a lost build.