Click the following link and follow the steps on the pages that appear.
Notes
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Your Passport profile contains two e-mail addresses, one for signing into Passport (see the Sign-in name field in your profile) and one for sending e-mail to you (see the E-mail field in your profile). For the Microsoft Office Internet Free/Busy Service to work, the address in the E-mail address field in your profile must match the address you use with Microsoft Outlook. To verify that these addresses match: on the Passport Sign-in page, click Member Services, and then choose to view your profile.