You are using the MS Discussion Groups web interface.
Click on your initial posting in this thread. Click on your name in the
"By" field in the upper left corner of the message. Click on "Recent Posts"
in the upper right corner of the User Profile window.
Caveat: I cannot vouch for the accuracy of the information returned by the
MSDG interface. The interface is notoriously unreliable. An alternative
might be to use the Google Groups Advanced Search feature. But I have found
that to be fickle as well.