This is a common usability approach for applications that are considered to be 'always on', i.e. also running in the background so that a user doesn't miss any notifications for example. Such apps usually feature a dedicated task bar icon with a resp. 'Quit' menu, and so does HipChat:
Accordingly, you should be able to cleanly exit HipChat by pressing the Start button, eventually expanding the notification area (many icons are 'hidden' by default these days), hovering over the HipChat icon and selecting the 'Quit HipChat' menu.
Thank you for the answer. I disagree with the usability approach. Whether I miss notifications is my decision. Ofttimes, HC is a distraction. Important communications can also be conveyed by other means. The meaning of Close (X) should be consistent. Appreciate you taking the time to provide a comprehensive answer.
@Kevin Shanholtzer - I actually agree with you (am just describing the state of affairs): This could and should be handled differently, e.g. by offering the likewise common option to 'Minimize to taskbar icon' instead (IIRC this would at least be consistent with earlier Microsoft design guidelines on how to handle the 'Minimize' button for background apps, don't know about Windows 10 though).
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