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#11
The standard Microsoft support scheme has always been based around a period of ten years - split into Five years active support, (including feature updates), and five years extended (security only).
There is a change in progress brought on by the Windows as a service model used for windows 10 - In this model the product is continuously updated, (Twice a year of free in the case of Windows), but any one release is only supported for two years. So it's actually a lifetime support as long as you update when needed, (and your hardware is still suitable)
There is some rumor of this type of support being introduced for Office (Office 2016 is actually a traditional Version/alternative to Office 365), but not sure how things will unfold - The switch to a fully leased software model is something that a lot of businesses prefer as it helps control cash flow and business customers are Microsoft's main revenue stream.
What I would suggest is that you download a copy of LibraOffice and give it a try - in fact with your use of the very old 2003 Office, LibreOffice will be less of a change, (shock?), than Office 2016 - If you find that Libreoffice is not suitable for your precise needs You could then look at an upgrade of your system to the latest office, (2016 or whatever they call the next one, we are due a new version soon-ish))
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