If you are using this procedure, then most likely the AutoDiscover record has not yet been created for the domain. It is highly-recommend that the AutoDiscover record be created as soon as possible since Outlook uses it for free/busy info, out-of-office replies, GAL, and auto-setup of accounts. Your AutoDiscover DNS record has to be created with your domain registrar (DNS provider). Note that the CNAME will appear as the following:
autodiscover.yourdomainname.com CNAME adr.exg6.exghost.com
Please ensure that the following procedures have been implemented before setting up Outlook 2010 manual configuration:
1. Click Start, double-click Control Panel, and then click the Mail icon.
2. A Mail Setup dialog box will appear. Click the Show Profiles... button.
3. From the Mail dialog box, click the Add… button to create a new profile.
4. The New Profile dialog box will appear. Enter the user's e-mail address and click OK.
5. Select the Manually configure server settings or additional server types check box, and then click the Next button.
6. Select the Microsoft Exchange option button.
7. Enter the Microsoft Exchange server address. (This may be determined by loading the account in Outlook Web Access, selecting Options and About, and then copying the address shown after Mailbox Server Name near the bottom.) From here, enter the user's full email address in the User Name text box. Click More Settings.
8. Click the Connection tab.
9. Select the Connect to Microsoft Exchange using HTTP check box, and then click the Exchange Proxy Settings button.
10. Enter the settings exactly as shown below, and then click OK, OK, Next, and Finish.
11. Check the Mail dialog box to ensure that the newly set-up profile has the Always use this profile option button selected, and then click the OK button.
12. Open Outlook, and then sign in using the full email address and password for the account. Select the Remember my credentials check box if you want Outlook to remember your password.
13. Your e-mail account is now set up in Outlook 2010.