We updated our certificate in the Windows client recently and it's still flagged as new which is why you're getting the error. It takes a while for it to be recognized, but the app is definitely usable. Totally understand if it makes you uneasy, so feel free to use our web client at hipchat.com/chat and check back in a couple of days.
...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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