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Kobo's got all that ... its "shelves" feature is what would be the "folders" you mention. you can place a book in multiple shelves.
as for the time-length durability, i'll be honest that i don't think any company's making a machine they intend to still be working 4-6 years from now. if you can get 6 years out of an ereader, that's great, but i don't think anything past about 2 is what they plan on.
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