Who would i send this email/letter to regarding MSN Messenger?

I have some some ideas about MSN Messenger. Who would i send a letter or email to about my ideas so they could maybe be in an update or something like messenger plus?

Who would i send this email/letter to regarding MSN Messenger?
The link below is the Feedback option on the MSN homepage. I would start there first. If you don't get any response then try writing to one of the options under link 2.