OS X :: How To Leave Mail In Server

I'm leaving town and like to retrieve email from web server in those oversea internet cafe while still wish to leave incoming mail in my inbox at the home computer. Here's the confusion using Mail.

In Outlook Express, its very clear. We check the box "leave mail in the server". If we don't check it, nothing will happen.

But in Mail. it seems the reverse.

A) If we don't check the 3rd box, does it means forever its in the server?

B) Now if we check the 3rd box, we prompt the server to remove mail which in this case after one month and I'd assume the mail will be auto removed after one mth. Then what is the use of the right box (remove now).

I have done some experiment and it seems confusing. What I wanted was to able to retrieve mail from web server whilst in oversea while still maintaining all incoming mail for by home computer until my next order.