IMAP servers on the other hand store your mail permanently on the server. Outlook Express can also store copies on your own computer, so that your local copy is an exact mirror of whatever is on the server. When you delete an e-mail in an IMAP account, you are deleting both the local copy and the server copy. To prevent accidental deletions, IMAP servers do not totally delete a message until you issue a Purge command (Purge Deleted Items on the Edit menu, or the Purge toolbar button). IMAP also has a command to Undelete a message (also found on the Edit menu). The main advantage of IMAP over POP3 is that, since all messages are on the server, you can access all your mail from any computer with an Internet connection. You can also create subfolders on the server (and in your local Outlook Express account) to better organize your mail. The disadvantage is that most ISPs limit the size of your mailbox, so an IMAP mailbox will fill up much more quickly than a POP3 mailbox.

"If you need an IMAP client, don't use any version Outlook or Outlook Express. Get a real e-mail program." Seriously?