>>
>>You can find all details in RFC 1939 - Post Office Protocol - Version 3 http://www.faqs.org/rfcs/rfc1939.html
>
>Thanks; it seems from this document that leaving too many messages on the server is not efficient.

Hilmar,

It can be particularly useful for folks who travel with a laptop...so they can still have all their email on their desktop when they get back home.