Hi Fluffy,
please read this two articles
http://support.microsoft.com/default.aspx?scid=kb;en-us;320693&Product=winxp
and
http://support.microsoft.com/default.aspx?kbid=227391

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Ich habe nichts gemacht, gestern gings noch
> I use Windows XP as my operating system and have recently updated from Office
> 2000 to Office 2003. I can get online using my IE browser but I cannot get
> on through Outlook 2003. I keep getting this message: "Error 623: The
> system could not find the phone book entry for this connection." What do I
> need to do so I can go online through Outlook 2003? Thank you for your
> guidance.