Office 2003 was the high-water mark for Microsoft Office if you prefer its traditional dropdown menu interface. While it featured very XP style colors and icons, it's also the earliest Office to support Windows 7, plus supports later type office files like .docx with the Office 2007 Compatibility Pack. It went out of support in April 2014 at the same time as XP.
Office 2007 was the worst for an old-school user as it switched all functions entirely to cryptic scrollable ribbons so both nothing is where you'd expect it to be and there's no text to help in finding it. 2010 added back some text descriptions to the ribbon tab icons so at least you could figure out what they did without having to hover over each, but of course the huge ribbon still takes up plenty of screen real estate which is only usable with a high resolution monitor, otherwise you'd have to edit your document in a mail slot, much like a browser with too many toolbars*. Later versions started defaulting to OneDrive cloud storage of your documents--but at least this
doesn't mean they own your documents so
are free to data mine it for keywords and images to determine what advertising to send to you, as in the free Google Docs or Office Online (the free version of Office 365 subscription).
OpenOffice and LibreOffice are the closest things to a still supported Office 2003 with both featuring a dropdown menu system, local storage and no subscription fee. Plus they are open-source and free to use.
* opening every available toolbar in 2003 at the same time can provide a similar experience
It's just like Windows--they keep changing the locations of where things are so the office can stay exciting, like a treasure hunt. Eventually you get used to it after googling it enough times, and then they'll change it again.