“Sadly I have to move to WIN 10 and upgrade office from 2003.”
I hold on to my Office 2003 CDs like Grim Death. When we’ve relocated, they’ve gone in my purse. (Not even my jewelry goes in my purse.) DH was forced to rent that evil 365 for his Windows 10 system, and it’s a nightmare. When/if I ever need to go there, I’ll go full Luddite and revert to pen and paper.
My “new” laptop is a refurbished Dell Windows 7 system via an Amazon vendor, on docking station with USB keyboard and large monitor. Almost two years old, and kicking ass (knock wood).
I wish you luck, as shopping for a computer can be frustrating.
It's fully compatible. My co-workers here in a windows-centric office don't know that I use it exclusively. I exchange docs/spreadsheets/etc with them on a daily basis.
And it's free.
You can also look at OpenOffice
https://www.openoffice.org/
PC World review:
https://www.pcworld.com/article/3228112/apache-open-office-review-office-alternative.html