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$16bn health agency managed finances with Excel spreadsheet.
(www.theregister.com)
This is a most excellent place for technology news and articles.
It sounds like JDE. My company uses it, but they don't even use all of the built in features. They do a bunch of stuff manually that they could just do with the software they're paying for.
Odoo actually. You more or less can't use all the features, there's too many. That doesn't mean it's the best ERP, it just tries to be a true generalist, which means it needs lots of customizations usually.