You can only delete messages currently from the History – I think you may have to be in the Browser version as well, I'm not sure. https://confluence.atlassian.com/hipchat/delete-messages-and-files-751698289.html
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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