I can delete user stories and tasks, no problem, but I can't figure out how to delete a comment from the discussion in a VSTS user story.
Simply hover over any comment that you own, and you will see two new buttons appear. The first is the pencil icon you can click to edit your comment, and the other is the overflow icon where you will find the delete comment functionality.
Click on the Changeset [number] link for the changset you are interested in. Above the changeset details panel click on the little speech bubble with the plus sign, a textbox will appear and you can enter your comment - hitting Enter will save the comment.
To delete a single work item, open the work item, choose the Actions, and select Delete.
You can't. The work item history is immutable.
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