Vista - Default Mail Client

I am using Windows Live Messenger and was using Windlws Live Mail as my
default email client.
When I selected the 'E-Mail Inbox' option from the Messenger Icon Menu in
the task tray this option would automatically load Live Mail.
Now that I have un-installed WL Mail and started using Outlook 2007 and
Outlook Connector, selecting this menu option from the Live Messenger icon
in the Task Tray load Internet Explorer and takes me to my inbox on the Live
Mail web client.
Outlook 2007 has all of it's defaults under Program Defaults and Outlook is
set as the default mail client.
Is there any way of setting this option in the Live Messenger menu to load
Outlook rather then the Hotmail web client?
Peter