There's a MUCH greater obstacle for me, and it's called compatibility
The school I go to uses Office 2003. I've tried opening documents in OpenOffice.Org from newer office products and i've had problems. It ignores my powerpoint color schemes, objects in my presentation seem to have shifted positions, the object precedence\order has been changed for some reason, the margins can be screwy, and spacing is different. With OpenOffice.Org, a double-spaced paper in the same font requires more text to fill a page by default (one of those "WTF" things). People just want stuff to work. I would save in the OpenOffice format, but I can't read those files virtually anywhere else. I would save in the HTML format too, except it doesn't support Autoshapes and some other stuff that's useful in non-formal papers.
I've even heard people bring OpenOffice.Org up at school, but they still wont use it. Office suites are one of those things where ease of usage, the used-to-ness factor and productivity (other two factors weigh in here) defeat openness. As for security, the general public hasn't really found any reason to worry with Office (haven't heard a single thing about Macro viruses lately).
OpenOffice.Org is dissapointing to me, but part of that is probably based off it's relationship with Sun Microsystems. (That's not an attack at the people who work there, but MadHatter and Java haven't inspired me to use or adopt them at my workstation)
[ November 19, 2003: Message edited by: anphanax ]