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That's more people than you can fit into a baseball stadium! We have a huge stadium here, and it only holds 50K people. When the game ends, all of downtown is gridlocked for two hours as the mob tries to get out. Your poor server would be one busy little puppy. I'd love to see your hardware spec!
That limit only applies to the number of users with the ability to sign onto your machine as users. It isn't a limit to the number of people that can connect to a webpage on it, or to use it as a mail server. Of course, if your web/mail/dns server is going to have more than 65,000 simultaneous users, you better be on top of your sysadmin game!
I've read that this is one of the biggest issues with Linux. In many corporate environments running advanced Unix systems, it is quite common to have several hundred thousand users per machine. I believe this is accomplished thru the use of 128-bit architectures which can address 14.5 Bazillion bytes of memory.
Many corporate IT departments have shied away from Linux because it only supports 65K+ users. We really need to work on this.......