Why Switch?
In order to set up an Exchange account in Microsoft Outlook, it must be set for Corporate Workgroup. If you have had a POP3 account previously setup, if might be set for Internet Only . This will not allow you to add an Exchange account
Making the switch
To change the installation type from IMO to CW, follow these steps:
1. On the Tools menu, click Options.
2. On the Mail Delivery Tab, click Reconfigure Mail Support.
3. On the E-mail Service Options page, click to select the mail support option you are switching to. Click Next.
4. Read the warning message and then click Yes. Outlook will close.
5. Start Outlook. The Windows Installer will start and install the required files.