If you are asking if HipChat has access to the full 1-1 message history, the answer is yes (unless the group is using HipChat Server beta, then the answer is no).
If you're requesting access to 1-1 message history, then you will have to email support at email@example.com and they can guide you through the steps. Please note, you will have to be the owner or admin of the group to request this info.
Hope this helps,
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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