Outlook Express (OE) has many configurable options. If you never make any changes to the default settings then you are almost certainly missing out on significant usability and performance improvements.
Changing OE options is very easy. To get started just bring up the Tools menu, and then click the Options button. Recommended option settings are covered in detail in the relevant option group sections of this document.
Configuring OE is particularly important if you access mail on an IMAP server as there are some very effective performance settings. These are highlighted in the relevant options sections. IMAP users should also read the IMAP Considerations section and review the IMAP Example.