I have recently installed OpenOffice on our network along side MS office 2000. Trying to get the users to get used to OpenOffice, to save use upgrading our existing MS Office to a later version. On the whole the response has been positive.
One reaction I got, when I first suggested OO was "but it's not Microsoft" My response was polite but to the point. After I pointed out the benefits to OO, they started to come around to it.
I have been using OO for a little while, but must admit that I started to use MS office again for a while. Anyway, I am back on the straight & narrow & am using OO most of the time. I only have OO on my home machine & works laptop. I have both MS & OO on my works machine, but when I do re-install it will only have OO. Personally I prefer OO & I think the users on the network will start to like it. The only problem I have is with Access & Publisher files, so I need to keep these available to users. I don't use them myself. Powerpoint files sometimes look strange when opened in Impress, but a bit of tweaking should sort that out.
I think it is very viable, especially to new users who are not used to MS office & got stuck in their ways.