[FlapJack23]

it would work for that, but wouldn't there not be enough storage for 70,000 people to connect at once to the one box? when you think about it, your isp offers sometimes 2 gb of amil, and then they offer web hosting which is nother couple gb, and then they have all those web apps which must take loads of space, so for 70,000 people wouldn't you need more storage space.

[Chantelle]

the box it connects to doesnt have the storage on it would connect to powerful front end servers

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THE INTERNET 

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ISPs ROUTER and firewall switch
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Front end servers (several really really powerful ones like above)  
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Internal Firewall / Router/ ISA server (defense system between the perimeter and ISPs interal network)
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Large mail storage servers maybe 20 or 30 all with 3TB Huge Raid arrays on clustered spreading all the mail boxes over each other on several stores and storage groups.
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Your mailbox may not be on these physical servers but may be on other mass grop servers in the ISPs network so you are routed down to another routing group across their internal network as it finds your mail box request.

Does that make any sense?

What Im trying to say is for the large masses of numbers like 70,000 it was an example where such powerful servers would be needed but you would still need to balance the loads

[FlapJack23]

ok i think i get it now, thanks for the graphic.