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I got a question, as you are an user: that number of users it supports, is that only a "recommended" number, or it is a hard limit/peak? Or you can simply use as many users as physically possible if the appliance can "hold" it (in case, for example, of very low traffic email accounts)?
The user amount is a recommended amount, realistically depending on how extreme your users are these can go way over that limit especially thes 6100 appliances which are a lot beefier than the lower 4100 and 2100 appliances.