After you try to use Auto Account Setup to connect to your e-mail account using Outlook, the following message may appear.
Microsoft Office Outlook
Cannot open your default e-mail folders. Microsoft Exchange is not available. Either there are network problems or the Exchange computer is down for maintenance.
This error can occur during Auto Account Setup if the person who manages your mailbox has turned off Cached Exchange Mode for your domain. If Cached Exchange Mode is turned off for your domain, you'll need to use POP or IMAP to connect to your mailbox instead of using an Exchange account.
If Auto Account Setup can't successfully connect you to your account and you need to connect to your e-mail account immediately, use a Web browser or an e-mail program that supports POP or IMAP to connect to your account using Outlook Web App. For information about how to connect using a Web browser, see Supported Browsers for Outlook Web App and Exchange Online. For information about how to connect using a POP or IMAP e-mail program, see Use IMAP or POP E-Mail Programs.
If you're still unable to connect, contact your helpdesk.