SquirrelMail is a mail client, it talks to a mail server, fetches your mail,
displays your mail, and does all the nitty gritty work for you. This is also the
case with Outlook. It is also mail client. It talks to the mail server, fetches
the mail, and does all the nitty gritty work for you. Outlook cannot talk to
SquirrelMail because SquirrelMail is a client and not a server.
To obtain the IMAP server settings your Outlook client needs, the best people to
ask are those whom you get your mail services from. If you're not quite sure how
to reach them, try hunting for support information on the website where you
signed up for your email service. If you are at a college or university, try
speaking to a teacher. There's no point in contacting the SquirrelMail project
team - we don't know which settings you need.