Because they're not techies and don't trust themselves to 'throw up a few server...

PieSquared on June 24, 2008 | parent | context | favorite | on: Outlook Dropped For Gmail in Australia... 1.5 mil ...

Because they're not techies and don't trust themselves to 'throw up a few servers' reliably? I dunno, that's my guess, since it seems they were looking for an email contract both with Outlook and now with Gmail.