MS disabled it:
Windows Messenger and MSN Add-ins for Windows Messenger
This note applies if you are using Windows Messenger instead of MSNŽ
Messenger.
Windows Messenger 4.7.3 is included in SP2, but it does not support MSN
add-ins for Windows Messenger. To continue to use these add-ins, you must
install and use MSN Messenger, which you can download for free at the MSN
Messenger Web site.
http://www.microsoft.com/technet/pro...y/relnsp2.mspx
Joe
"Joe727" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>I installed the XP SP2 beta on my main XP Pro (Retail) machine. When I
>click e-mail in Messenger 4.7.3000, Outlook Express opens instead of my
>Hotmail account.
>
> On my other XP Pro (Retail) PC, I have not installed the SP2 beta, and
> Messenger still opens Hotmail.
>
> Question: How can I configure Messenger to open Hotmail instead of
> Outlook Express on my SP2 beta PC?
>
> Thanks
>
> Joe
>
>