Deactivating the user (by going to hipchat.com/admin/users) should behave just like deletion (and allow the user to be recreated via other means, like an import). If that isn't working, however, I'd recommend contacting the support team at email@example.com and they should be able to more fully remove the user so that the import works properly.
...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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