 
Open the mailbox
When you open the mailbox, the device asks if you want to 
connect to the mailbox (
Connect to mailbox?
).
To connect to your mailbox and retrieve new e-mail headings 
or messages, select 
Yes
. When you view messages online,
you are continuously connected to a remote mailbox using 
a data connection. See also "Connection," p. 90.
To view previously retrieved e-mail messages offline, select
No
. When you view e-mail messages offline, your device is
not connected to the remote mailbox.