Hatred of Change
What I'm seeing is Olde Fashioned FUD (Fear, Uncertainty and Doubt). Before you brand it as a bad idea, at least try it; you may well be pleasantly surprised! And to the OpenOffice.org folks, I have nothing against OO (in fact, on Linux I use OO); however, OO has no mail application (Outlook is the Office 2010 application I use the most, just as it has been in every version of Office since 2000), and until OO actually includes a decent mail application (Evolution comes to mind) it will be, at best, a secondary productivity suite for me personally. (Evolution comes the closest to Outlook functionwise, and I don't use Outlook as an Exchange client.)