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FWIW, this thread was moved to the Mac Apps forum about 4 hours ago.
Yeah, FWIW?!
So sorry, but OP has willingly chosen the EarlyIntel-SubForum, because he was searching for a solution about "Office on an outdated machine/OS" ... 🙄
 
I think it depends how complex the office documents that you're using are i.e. you might be able to get away with using Pages 09 still etc.

I suspect it's probably the case that most people only use office features that were fully mature 10+ years ago.

Office is a pretty mature product anyway, with most of the new stuff in 365 being around UX, ML collaboration and cross suite features.
 
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