"Even if your initial response is a resounding "meh" -- there are other web office suites, such as Google Docs, and even the Ulteo Linux/OpenOffice suite -- there are just so many other implications in Microsoft's making this available for Firefox, never mind Safari and the Linux operating system.
"Is it an unspoken acknowledgement that open source software and systems are popular, and prevalent enough that neglecting to support them would be -- foolish? Even more alienating? Financially damaging? Giving Google the upperhand? All of the above?"
