Hes asking for office xp not office 2003https://www.catalog.update.microsoft.com/Search.aspx?q=office+service+pack
office service pack 3 is on the above page, you will have to scroll and go on to the other pages for other service packs for office 2003
yes there are lots of updates
https://www.catalog.update.microsoft.com/Search.aspx?q=office 2003
https://montcs.bloomu.edu/Software/Other/Microsoft/OfficeXpSp3-kb832671-fullfile-enu.exe
SP3's full file installer - you will also need the disc or mounted/extracted ISO image of MS Office 2002/XP (and any additional components that are part of Office like Publisher 2002) to proceed with the install. There are also 24 post-SP3 patches which can be found here along with a batch script to install them (patches are required to install the 2007 MS Office Compatibility Pack)
https://www.dropbox.com/s/j0zdwe4woufmp80/OFFXPPostSP3.zip