If you are looking to "buy Microsoft Word 10," it is important to clarify that (historically part of Office 2002) is obsolete and no longer sold. Most users searching for this are likely looking for Word for Windows 10 or the latest version of the standalone software.
This is the modern way to get Word. It ensures you always have the latest features and security updates. buy microsoft word 10
You can use a basic version of Word for free online at Microsoft365.com if you have a Microsoft account, though it lacks some of the advanced formatting features of the paid desktop versions. If you are looking to "buy Microsoft Word