>>>but can I still buy Office 2010?
Not officially. There are plenty of websites offering it, e.g
http://www.mrhightech.com/office-suites/3495-microsoft-office-home-and-business-2010-0885370047707.html
but they're not authorised Microsoft resellers (even when they're websites claim that they are):
https://uk.trustpilot.com/review/mrhightech.com
Your best chance of getting hold of a legitimate copy is to hunt around local independent computer retailers, to see if anyone has the 2010 version still on their shelves.
However I'm still confused as to why you should want Microsoft Office anyway. OpenOffice is just as good (as indeed are LibreOffice and Kingsoft Office Free).