Well, it all comes down as to how it has been dealt with.
For e.g.
You have a windows dedicated web server with MS Exchange Server installed on it, you would probably need a windows administrator who has experience with Exchange Servers. Please note, if your hosting provider has windows technical support team who specialize in Exchange Servers, most is done instantly without you actively involving in the server configurations.
However, a bit basic is required everywhere.
Regards,
Shane Phillips