I'm using 2003. I don't really care about the version since I'm just using it on creating some entry on my blog.
I think I am still using office 2000 and it meets all of my needs so I haven't found the need to upgrade!
Office Ultimate 2007 - Even better than Pro. We use Groove for managing work between remote developers and project managers so Ultimate was the logical choice. I've been using 2007 since it was released and wouldn't go back to 2003. It may take a little while to get used to the ribbons but once you do you'll find the new interface helps productivity.
Currently using 2003. 2007 is great, but don't get the part that why MS chose to make a new format, that docx.
.docx is a new file type for the Open XML format. This format allows any application that can consume XML to work with and understand the data stored in the .docx file (or other office documents). For more info see this MSDN page - http://msdn.microsoft.com/en-us/library/aa338205.aspx
Currently I am using office 2007 and I have been using it for one and half years. At first I faced some problem to adjust with the look of the office 2007. Now I am not facing any difficulties using it.
Aaaa Office 2007 is terrible. From 3 days I am working with it and I hate it. It is so different from all other versions and too little improves
Yeah I have Office 2007 but I like Microsoft word 2003 because my computer is not that fast so it takes time to open, but the extra things they added in Microsoft 2007 for powerpoint and all that is really good!!