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mmmm
do not confuse your selfe, Office 356 is another whole pack of office which include Excel and other office programs.
Excel is a part of it.
Regards
office 365 is the full package which contains office 2016 and that means that office 365 is is the original source
Office 365 is a subscription service that includes the most recent version of Office, which currently is Office 2016. It comes with the applications you’re familiar with, like Word, PowerPoint, and Excel, plus extra online storage, ongoing tech support at no extra cost, and more.
You can choose to pay for an Office 365 subscription on a monthly or yearly basis, and the Office 365 Home plan lets you share your subscription with up to four members of your household. Different Office 365 plans are available for home and personal use, as well as for small and midsized businesses, enterprises, schools, and nonprofits.