Admin Privs still required for WM5.1 & XPSP2 UPnP dynamic port mapping?

I have read in the past that administrator priveleges are required for
Windows Messenger to do its UPnP thing and deal with dynamic port
assignments. Is that still true with SP2/WM5.1?

The reason I ask is that if I use the "Internet Connection" applet that
seems to give me UPnP status, it shows ports being mapped even though I
am logged in as a limited user (ie, not full administrator privs).

Is this still true? For WM5.1/XPSP2 to function properly, do I need to
be logged in as a user with administrative priveleges?

I have gotten a few "Im not sure, but I think so" answers (I do indeed
thank those who replied to me), but I am hoping for some kind of
"definitive" answer, and if possible, from Jonathan Kay.
Thanks in advance,

Joe