Hi,
Outlook Express and Windows XP are not supported by Microsoft now. To get better support and user experience, it's recommended to upgrade to a newer version of Windows and Office programs. For your question, you may try post a new one in the following forum to get further assistance:
http://answers.microsoft.com/en-us/windows/forum/windows_xp?tab=Threads
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Steve Fan
TechNet Community Support