You can sort your messages by date, size, subject, etc simply by clicking on the name of the column you want to sort by. By default, email is sorted in reverse date order (that is, most recent emails appear at the top). When you have sorted by a particular column you will see a /\ or a \/ beside the column name to indicate that the column is sorted in ascending or descending order, respectively. You can reverse the sort order by clicking on the same column name again. You cannot at this time set to permanently sort by a particular column.
To view another folder, for instance to see your sent items, if the folder tree is not hidden, just click 'Sent Items' on the tree. If the folder tree is hidden, select 'Sent Items' from the 'Folder' popup then click the 'Go' button.
You can view messages in a different folder by selecting the folder you want to view messages in from the popup menu, and then clicking the 'Goto' button.
The 'Poll' link opens a new window that automatically refreshes itself every 5-60 minutes, depending on your service level. It lists the number of new/existing emails in your inbox. It also changes the title of the browser window to "number of new/number of existing" emails, so on a Windows machine, you can minimize the window to the taskbar, and just glance down every now and then to see if you have new email.
The meanings of each column are:
Sel: Whether the message is selected or not. You can click a checkbox to change the state.
A: (stands for 'attachment') The symbol '[*]' is displayed if the message has any attachments.
F: (stands for 'flags') The symbol '<<' is displayed if the message has been replied to.
Size: Size of the message in kilobytes (kb) or megabytes (mb).
Received: The date the message was received by the server. This is shown in your current time zone which you can change on the preferences screen.
From: Name and email address of who the message came from. You can click on a persons name to compose a new, empty email to that person.
Subject: The subject line of the email message. By clicking on the message subject, you can read the message contents. If the message is a saved draft message that you were previously composing, clicking on the subject will take you back to the compose screen to complete the message.
The dropdown menu on the Mailbox Window is only for one-time changes. In order to change it permanently go to Options and then the Folders screen. There you can set the 'Rows to display' for each folder.
To find out how much space is being used in your account or an individual folder, simply click Preferences, and then Quota Usage. You'll be sent an email warning when you reach 90% of this. You can quickly delete or zip-archive old messages from your account at the 'Folders' screen, via the 'Purge/archive' button at the bottom of the screen.
To empty your Trash, or delete all emails in a folder, go to the mailbox page and select the 'Select All' item in the Action popup at the bottom of the screen, and then click 'Do'. Next, ensure that 'Delete' is selected in the Action popup at the bottom of the screen, and then click the 'Do' button. If you are in the Trash folder, it will be emptied; in any other folder the contents will be moved to the Trash.
You can permanently delete all the items in the Trash folder by selecting the 'Empty Trash Folder' item from the Action popup at the bottom of the screen and then clicking the 'Do' button.
When the folder tree is visible, at the bottom of the tree is an area titled 'Resource Usage'. In this section you'll see two rows:
MB - This row shows the amount of mailbox quota you've got, and how much you've used.
BW - This row shows the amount of bandwidth you've got available this month, and how much you've used this month. The used figure is reset on the first of each month.
You can click on the 'MB' or 'BW' part to go to a screen with more detailed information on each resource.