I just downloaded MSN Messenger 5 and noticed the addition of the "Customer Experience Improvement Program" which allows Microsoft to collect anonymous information about Messenger usage:

http://messenger.microsoft.com/support/sqm.asp

"Here are a few examples of the questions we are trying to answer through the data we collect:

What percent of people are unable to sign in to MSN Messenger?
What is the average time it takes someone to sign in?
What number of sent messages never reach the recipient?
What percent of people get disconnected when using MSN Messenger?
What percent of people are unable to establish an audio conversation? "

It's got a horrible yellow box at the top of the Contacts window asking you to register, just great, something else to annoy me along with all those tabs and adverts.

What do you think?