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www.pcpro.co.uk/realworl ··· upgrades"When a market is static or contracting, or when you're a dominant player with few competitors, there's little reason to offer free or cheap upgrades from your older products, or those of your competitors; if you can't make enough money from selling perpetual licences to new users, you need to look for alternative revenue streams.
That's why Microsoft removed all "upgrade" pricing from its Office product range when it introduced Office 2010."
Looks like you missed the upgrade discount by about 7 years.
If you just want Word, that's $109 from Microsoft ($80 from Amazon.com). Or for $30 more you can get the bundle (less Outlook) of Office Home & Student.