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Correct me if I'm wrong, but didn't Quickoffice used to allow signing in from multiple services? I remember using an older version of Quickoffice that allowed logging in with Dropbox, SkyDrive, etc. while this new version appear to only work with Google accounts.

[ZoF]

You're correct, Quickoffice did allow login from multiple sources in the past.

Obviously Google would remove that feature as they now own Quickoffice, I would have been FAR more surprised if they kept it in.