Excuse me, but what of "NT couldn't handle it." did you not
Since you appear to have missed it first time around:
>The software giant [Microsoft] has attempted to exchange the
>Sun/Solaris infrastructure of Hotmail with NT since buying it in
>December 1997. However, the demands of supporting 10 million users
>reportedly proved too great for NT, and Solaris was reinstated.
>In a leaked report, [...] "NT couldn't handle it. [...] The
>engineering team did its best to run NT - and failed"
As our resident quote-ster would say "denial isn't a river in Egypt".