Till,
Those were my thoughts as well, but then I started thinking about redundancy. If you put all mail/web/db services for clients on one server, and that server goes down, all the other servers that have a similar setup are still up and fewer people are affected. if you have a dedicated mail server or DB server and it goes down, you are affecting a larger number of people.
The downside would be more services to maintain on more machines.
Thanks!
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