Maximum number of users per Front End, assuming no AV

I know that MS recommends 80,000 user limit per pool, and 6000 per Front End server, but that's certainly going to be assuming you are using the Front End services to some degree.
A/V, I'm certain, is a fair overhead. Is there any kind of idea what the user limit per Front End server is if we assume the Front End is *only* doing IM and Presence?

Using the capacity planner at a server built out with full specs, it's still suggesting 6600.  Without Mobility, 7200.
Microsoft doesn't publish more than that so the rest is an at your own risk.  If you have enough users that it would be a concern, I'd just stick within the supported models.  You could start low and scale up by adding a front end or start
high by removing a front end.
http://www.microsoft.com/en-us/download/details.aspx?id=36828
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