lukipela: Oh yeah, im sure. If you have to lie to support your argument, doesnt that mean your argument is probably faulty?
http://www.techsoup.org/learningcenter/software/page4765.cfm I am assuming your "business" runs along the lines of the business listed at the end. As far as performance, Office outdoes OpenOffice in every single area. The only people using OpenOffice are the people that cant afford Office or are opposed to it for political/philosophical reasons. Please stop perpetuating the myth that one speadsheet application is the same as another. Its not. The reason Office dominates the business world is because its better. They arent going to pay through the nose for an inferior product, especially if the better product was free.
Vaemer-Riit: I just read through the article and the only type of business it tells to steer clear of OpenOffice are offices that use "highly formatted documents or complex Excel functionality"
Yeah trust me, the only ideological argument in this thread is lukipela's. Don't worry about it, he's the same as a Linux, MS, or Mac zealot, rational argument won't sway him.
For the rest of you, you can very well use OO.org or LibreOffice, especially for home use, even if someone sends you an occasional MS file formatted document, it handles them fine. Most people don't use much of the functionality in these apps anyway, having them is like having a TI-85 calculator to do balance your checkbook, there's no reason to spend a huge outlay of cash on them.
And as for TCO, the true cost of having Office will become apparent to anyone who's had a BSA audit. They've typically been very unforgiving of a few instances of non-compliance even when tons of the desktops actually were licensed.