Outlook and Outlook Express (OE) are the most popular mail clients under windows. Other options include Netscape, Mozilla and Eudora. Outlook Express (as part of Internet explorer) is bundled with all versions of windows operating systems and Outlook is part of office suite. Techniquely, OE is the simplified outlook since outlook have all functionality of OE and can also take care of task list, notes, journal etc. The following discussions apply to both OE and Outlook.
To add an account under OE, go to Tools -> Accounts -> Mail -> Add -> Mail.... An Internet connection wizard will lead you through the procedure. Be careful of the difference between POP3 and IMAP account. All pop3 accounts will put emails in the same local inbox and an imap account will add another account on the left panel.
Because IMAP account manipulates mailboxes on the remote server, you need to specify the folder under which you store your email. This folder is usually `Mail' under your home directory but can be `mail'. The internet connection wizard does not provide this option and you have to do it afterwords, by going to Tools -> Account -> `your IMAP account' -> properties -> IMAP -> Root folder path. You also need subscribe your mailboxes by choosing `IMAP folders' after you right click your IMAP account.
Please refer to the emailing tutorial in the how-to section of helpdesk website for a step by step guide.