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You upgrade Windows XP to Windows Vista. When you start Microsoft Office Outlook 2003 for the first time, you are prompted to set Outlook as the default e-mail client. You click Yes to set Outlook as the default e-mail client. However, when you restart Outlook, you are again prompted to set Outlook as the default e-mail client.
After you upgrade Windows XP to Windows Vista, Outlook is no longer the default e-mail client. Windows Mail becomes the new default e-mail client during a Windows Vista upgrade.
To resolve this issue, use one of the following methods.
Method 2Uninstall and then reinstall Office 2003. To do this, follow these steps:
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.