"Timeout": It is the longest time it takes to wait on reading data from remote mailbox. It could happen that when a user is reading data, certain problems arise and the transport of data stops, but the connection is still not broken. In such a case, the corresponding tab page of the mailbox allows no further operations on it and effectively appears to be "dead". A non-zero value (in seconds) can be selected to allow the said tab page exit from such a state after the specified seconds. if needed, a user should choose a proper value according to the internent connection speed of his/her.