An article of FUD.
Anyone that speaks poorly of Windows' memory management or multi-threading capabilities isn't worth listening to. NT was designed by the same guy (Dave Cutler) that made VMS which was the first mainstream OS to support virtual memory. Yes Windows 32-bit had limits, as all 32-bit OSes did, but these limits no longer exist on Windows x64. The 2GB user space per process is gone. The handle count limiits are gone.