Re: Wrong angle?
Not quite. If you think about Nexcloud as a synced file storage, then Dropbox started earlier. But Nextcloud is much more than that. It's more of groupware. Think file storage and sync, mail client, photo/video browser, calendar, contacts and more. All in a browser. And that does sound like Office 365. Just smaller, open-source and optionally self-hosted.
Karlitschek started coding Owncloud in 2010 and then forked it to Nextcloud, when his Owncloud chums decided to be less open-source and more "enterprise", aka "they've done Mongo". So LiveMesh is not the right comparison. However, it was a lovely product, but as soon as they turned it to SkyDrive, I went to Owncloud.