One of the great things about SquirrelMail is the degree to which it may be customized. Depending on the configuration, you may have several choices of themes, languages, folders, and other preferences. All of these may be changed without affecting any other users on the system. There are at least five main parts to the Options: Personal, Display, Message Highlighting, Folders and Index Order. More parts may be available depending on your SquirrelMail installation.