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I think, it could be a useful feature. From an experienced usage of the site, I have the impression as if they didn't see that, but I am not sure.

I know about Moderators should be able to undelete comments: it asks for the visibility of the deleted comments. This is about the visibility of the previous versions of the edited comments.

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As of October 2016, moderators can see comment revision history by clicking on the "edited" pencil icon next to the comment in question.

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    Shouldn't this question have status-completed, then? – Mego Jul 2 '17 at 3:00
  • @Mego no, since this is not a bug report or feature request. – ShaWiz Jul 10 at 12:37
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Up until October 2016 moderators couldn't see the version history of comments, though the revision history is kept in the database.

All we could see was an indicator that the comment had been edited.

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    However, while there is no user/moderator UI for it, we do keep comment history and can look it up if needed. – Adam Lear Oct 10 '14 at 12:27
  • @Anna wonder if that was ever needed though? – ShaWiz Oct 12 '14 at 7:39
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    @ShadowWizard Yes. It didn't exist until about two years ago, and was built out of necessity. (Can't speak about the specifics, but basically, to investigate allegations of mod privileges abuse.) – Adam Lear Oct 13 '14 at 14:38
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No; comment revision history is stored in the database but never accessed directly (only manually by a SE employee).

Comments are "second-class citizens," and they can only be edited within a five-minute window anyway. They're meant to be temporary "sticky notes," and storing revision history for them would be pointless.

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    Another minor correction: moderators can edit comments (their own and others') at any time. – Adam Lear Oct 10 '14 at 12:41
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    And because moderators can edit at any time, I (as a moderator) am relieved that employees can access the history if needed. If there is a dispute about such an edit, I want the data to be available. – Monica Cellio Oct 10 '14 at 22:19

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