[citation][nom]doomtomb[/nom]I use Office 2007 but I wouldn't spend money on Office if it didn't come with my computer. The .docx has caused so many problems when I save something and then can't use it on someone else's computer, why doesn't it just save it as a .doc so it's compatible with everything? I don't see any point to changing the filetype.[/citation]
The new OOXML file types are open source and XML based. Generally speaking, the filetypes are smaller due to compression and quicker to open than the old binary filetypes. If you want to see what I am talking about, just rename one of them to .zip and open it up to take a look. OOXML is Microsofts response to the long held criticism that it needs to support more Open Source standards. While there was a lot of controversy and debate on whether or not OOXML was a true Open Source standard, it did pass ISO certification last year. Whether or not you like OOXML, I think we should all be able to agree that Microsoft shouldn't stick with the old proprietary binary formats forever.