Microsoft Office 2003 is a far more meaningful name than Microsoft Office 11.
If you think so, then you probably don’t really interact with non-technical users.
I have seen many people afraid of compatibility problems, because:
- I have Office XP, on Windows XP, I think Office 2003 only works on Windows 2003
- not buying MapPoint 2004 in 2005, because it is too old.
- asking which one is newer, Win 98 or Win Me
- asking which one is newer, XBox or XBox 360
- asking about Windows XP server
So, although the version number does not mean much, it gives some logic in the marketing madness.