Never heard of RoboHelp Office - have you tried talking to Adobe?
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It's the old name for what we now know as RoboHelp (as opposed to TCS). At that time I think it included the bits we get now but then could be purchased separately. Rick will probably recall that better.
I don't have release dates but there is no expiry date as such. Support is only available for the current and previous versions. Beyond that they just keep running. X4 (12) and X5 (13) are problematic in that they require activation and can no longer be activated. For X5 there is a download to get around that. For X4 you are plain out of luck.
See www.grainge.org for RoboHelp and Authoring tips
I will do some more searching for X4 and X5 - perhaps these numbers will help.