1. Run desk-top set up as suggested in this article:
http://onlinehelp.microsoft.com/en-us/office365-enterprises/ff637594.aspx
2. Create a new profile in your Outlook.
3. Set up the profile automatically:
1) On the Outlook 2010 toolbar, click the File tab. Then, just above the Account Settings button, click Add Account.
2) On the Auto Account Setup page, Outlook may automatically fill in the Your Name and E-mail Address settings based on how you're logged on to your computer.
3) If the name in the Your Name box isn't correct, click the option button next to Manually configure server settings or additional server types, and then click the option button next to E-Mail Account.
4) Click Next on the Auto Account Setup page of the wizard, Outlook will perform an online search to find your e-mail server settings. You'll be prompted to enter your user name and password during this search.
5) If Outlook is able to set up your account, you'll see the following text: Your e-mail account is successfully configured. Click Finish.